What did the zero say to the eight?
Nice belt.
Why is 6 afraid of 7?
Because 7 ate 9.
finally… 
Why did the chicken cross the road? Because the rooster was on vacation.
What was the baby’s favourite constellation? The Big Diaper.
How do clowns like their eggs? Funny side up.
(Caveat: I’m exposed to 2nd grade humor 24/7.) 
Road trip game:
There’s all us, Mum, Dad and the two sons in the car on a long trip. For fun we do this: I start off by saying ‘I found a dead rat at the the side of the road, I one it’, then the next person says, ‘I two it’, next person says, ‘I three it’ and so on until we get to the person who gets to say, ‘I eight (ate) it’ and we all make faces and give disgusted looks at the person and say ‘You filthy pig, you ate a dead rat!!!’
Passes a bit of time anyway 
What do ghosts eat for dinner?
Spooketti.
What did the big chimney say to the little chimney?
You’re too young to be smoking.
What do you call two Spanish firemen?
Hose A and Hose B.
When is a door not a door?
When it’s ajar.
djm
What goes “Clip”?
Half a horse.
I’ve seen this joke about five different places (including newspapers!) since Monday morning. It’s really weird.
Someone is trying to tell you something. Maybe second-graders are not familiar with the term “cosmic lemniscate” (infinity symbol - an eight on its side).
Q: What did the eight say to the cosmic lemniscate?
A: What’s the matter? Can’t hold your liquour?
What makes this second grade humor? Seems top notch to me.
Why do parallel lines never meet?
They were never introduced.
An A, a C, and an E all walk into a bar, and the barkeep says, “Hey! You can’t have a minor in here!”
So they go back outside and A and E say mean things to C and he leaves.
A and E go back into the bar, and the barkeep shouts, “No you CANNOT have your own fifth in here!!!”
–James
Do you know the difference between an elephant and a banana?
.
.
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.
.
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I’m never letting you do the grocery shopping!
Two strings walk into a bar and order beers.
The barkeep shouts “GET OUT- 
we dont serve strings here!!”
Outside the one string says to the other ‘’ Don’t worry: I know what to do…",
“just let’s tie ourselves into a knot and muss our hair up… trust me”
So then they walk back into the bar and the barkeep shouts “GET OUT- we dont serve strings here!!”
“But we’re NOT strings…”
‘Whaddyamean yer not strings?!? Yer strings, aintcha??’ says the barkeep.
‘No-’ say the strings, ‘We’re afraid not!’
Who says second grade humor isn’t top notch?
What’s red and smells like blue paint?
Red paint.
How do you get an elephant into a Safeway bag?
You have to take the s out of safe and f out of way.
Mystified. Please explain.
Meanwhile:
“What is green and sticky, has wheels, hangs on the wall and whistles?”
“I give up, what?”
“A herring!”
“A herring doesn’t have wheels!”
“You can put wheels on a herring if you like!”
“A herring isn’t green!”
“You can paint it - then it’s green, and sticky too!”
“A herring doesn’t hang on a wall!”
“There’s nothing to stop you hanging a herring on a wall…”
“A herring doesn’t whistle!”
“You’re right. I just put that in to make it difficult.”
Someone hearing the joke would reply "there’s no “f” in way!
If confused, say “there’s no ‘f’ in way!” aloud.
Thank you, there is no confusion about that.