When is a cannon not a cannon?

From ADVENTURE COMICS #420

Vhen is a cannon Not a cannon?

Vhen it's a PENIS!

Yeesh! 

I don't know vhy Schupergirl has got her Hotpants in a bunch,

but she seems a bit angry as she throws a gigantic Phallic Symbol 

complete mit der Teschticles schtraight at ze comicky book reader!

Maybe she's mad because ze freshly fired cannon just blew a load of cannon balls into her Face!

Zat can upset some womens vhen zey aren't expecting it!

Chust ask Mrs. Fredrics...Er, I mean, SCHMUT!

Hulk has a package for you

From MARVEL COMICS INDEX #7A (with detail)

Vhat's green und purple und should NOT be visible on ze comic book cover?

Ze Incredible Hulk's incredibly obvious Penis und Testicles! Ach Du Lieber! "Hulk smash! Hulk getting angry! Now Hulk horny! Hulk getting kind of excited! Hulk want to show you his etchings!" 

 Yipes!  Gamma Radiated SCHMUT!!