Well sometimes, it just doesnt comes out well, you cant get any further. The tunes sound even worse than normal. All goes bad. 
So how do you guys keep up the good spirit in times of failure?
Are you sure you were not just ejecting bad notes from your flute for future playing?
Beer.
Whiskey, when itâs REALLY bad.
Anyway, when flautists and whistlers play the wrong note, itâs called âimprovisingâ!
ackâŚdonât be mentioninâ jazz here the modsâll be after ya 
Thatâs when Iâm thankful that itâs a hobby, and not a profession.
When things arenât working, trying harder only makes it worse. Sometimes you just have to be willing to laugh at yourself and give it a rest.
I always blame the instrument. âDarn things broken, I need a new one!â Sometimes out of the blue they start working again.
I couldnât have said it better myself, although itâs not really specific to bad flute days.
For me, what to do on a bad flute day depends on what the problem is. If itâs a bad embouchure day, switching to whistle is a viable alternative. If itâs a bad mechanics day, working on embouchure is a good way to go. If itâs just a motivational thing, you can learn a lot by listening.
Be proactive - have the beer first. You just never know, so be prepared, sez I.
Besides, it is a well-known fact that the more you drink, the better youâll sound.
My work here is done. 
I usually yawn repeadetly, or take sudafedâŚseriously - most of my âbadâ flute days relate to allergy caused clogged ears.
For example, I was playing with friends at a benefit for an hospital/orphanage in Malawi (just to clarify, the hospital is in Malawi - I was playing in the KC Metro)âŚsounded fine at first, and then felt like my playing was simply terrible - sounded bad with no flow. Yawned a few times, the ears opened up, and discovered I still sounded fine.
For those days when the fingers arenât just working right, or the embouchure is off, I agree with the beer advice above.
Eric
A good cry helps. Well, it doesnât help, but it comes anyhow!
I have no tears left anymore.
If you have to cry , donât do it lying down because your tears will fill up your ears and then you wonât hear anything.
also donât do it standing ,the tears will find their way into the flute, the salt will rot the pads, crack the wood and you wonât hear anything.
also donât donât do it leaning over , as the tears will drip onto the fiddle players strings, rusting them and she will box your ears and then you wonât hear anything .
if you still need cheering up , come and play flute tunes with me , my playing will make yourâs sound good.
i make a lot of people happy this way , itâs no fun for me , but itâs a living.
I pick up a different instrument. Bad flute playing sometimes leads to great harmonica, whistles, ocarina, or guitar playing. Even picking up a different flute might be the ticket.
agree with mutepointe!
and if nothing works, throw the darn thing out of the window!
whew, instant reliefâŚemmm no donât follow this adviceâŚ
but putting your flute away and do something else, different instrument or whatever you fancy and next time things will be ok most of the time, itâs trueâŚ
MY cure for bad flute-practicing is: I never play flute. Therefore I have NEVER had a bad flute practice. 
However, generalizing from my experience with other instruments with which I HAVE had a practice in which everything seems to go wrong, I second the idea of doing something different and returning later for a fresh start. However, before I stop, I try to play something really easy and beautiful and calming to me, maybe just a few notes, or a slow simple tune that I can play in my sleep. I think the urge to do this comes from my dog-trainer side, which insists on ending with success. If it works for the dog, I figure it will work for me, too. (Even if the dog IS the brains of the team 
)(Dang, the dog has the good looks, too! Oh well. I have the opposable thumbs. )
Well reading all your coments was cheering me up, thx. Maybe I will drink some beer next time or something stronger
And the advice for a different instrument is a great idea. It helps. I had grabed my flute out of its dusty casing and played some tunes on it.
Thx all!
To bad you donât play oboe. You could always blame it on a bad reed.
Sounds like a break is in order. When you keep trying but making lots of mistakes, what youâre practicing is those very mistakes. Give it a rest for a week or so. Play something else, or even nothing. Youâll come back fresher. When you start back up, play some nice easy tunes that you know really well for a warm up and for some confidence. Then, slowly build back to the parts that were giving you trouble. You may find that you can play them with ease.
I highly recommend whiskey as âsomething strongerâ, note the EY on the endâŚmake sure you have the right one, to get you in the right âspiritâ heheâŚ
Oh you poor little thing Jim, that is so sad. Sniff sniff 