There must be plenty. My vote goes to:
Here it is in full size:
http://www.averyant.com/Averys159.jpg
OK, top that.
You Can Tune a Piano, but You Can’t Tuna Fish? REO Speedwagon?
Meh, yours still wins.
The title to Fiona Apple’s second studio album is the longest in the world and holds the Guiness record. The full title is this:
When the Pawn Hits the Conflict He Thinks Like a King What He
Knows Throws the Blows When He Goes To The Fight And He’ll Win
The Whole Thing ‘Fore He Enters The Ring There’s No Body To
Batter When Your Mind Is Your Might So When You Go Solo, You
Hold Your Own Hand And Remember That Depth Is The Greatest Of
Heights And If You Know Where You Stand, Then You Know Where
To Land And If You Fall It Won’t Matter, Cuz You’ll Know That You’re
Right.
Also, this is the cover to Sinéad O’Connors first studio album (as released in Europe, but not America):
Oh, and I forgot about this one:
I’ve never listened to it, but I’ve always thought the title was swell.
Spinal Tap: Smell the Glove (US release)
Richard Cheese, Lounge Against the Machine.
Pat Boone, In A Metal Mood. (The cover scares me.)
I hate that album, but I love it at the same time. I hate it. When he sings “Rape Me” so happily and “I wanna fnck you like an animal,” I can’t help but laugh hysterically and feel horrible for it. 
My favorite is “Fight for Your Right (to Party).” 
Have you heard his version of “Me So Horny”?!?!?!
It is absolutely monstrocious and gut-bustingly funny. I hate it that I love that song so much. You should really hear his version if you haven’t.
The cover of Jim O’Rourke’s Insignifcance is out there. (The themes and lyrics are even futher out there.)
My fave funky cover
This one’s for Dale
How do you like this one then? 
Shameless self-promotion again.
Due to be released June-July.
I have fond memories of this, a pop up sleeve and, well, strange music. 1971 or around that time. Still have the album too.
I see someone beat me to Frank Zappa. Here’s another:
Chunga’s Revenve features the classic song, “Evelyn, a modified dog.”
And I’m surprised our marsupial friend from down under didn’t include this one from Mr. Zappa’s buddy, Captain Beefheart:
Trout Mask Replica by Captain Beefheart and his Magic Band. I think it’s one of the goofiest album covers ever.
I was so cracked up when I discovered that album I began with that I forgot the albums on my usual list, Chas. The Zappa ‘Weasels’ and the Beefheart ‘Troutmask’ would have to be on any shortlist.
Peter’s selection—Dr.Strangely Strange—is pretty obscure too, as well as weird, but I think it might have been reissued recently. I hope so; I’ve never heard it. There are one or two others a bit like it from that period that I’ll try to dig up tomorrow.
Hm. I saw the thread title and clicked in with the intent of posting Spinal Tap’s: Smell the Glove.
What are the odds?
I have always thought that orange and purple belong together. Unfortunately the picture doesn’t quite seem to have the colors right.
Any album cover by Tool…
Better than Songs For Gay Dogs I suspect.
Hey Dale - here’s one for you…
