Because they have a hard time puckering their lips the right way.
You're really bustin' Machops!
He was a little horse
It smells like teen spirit.
The Spanish Inquisition.
Because dogs can't whistle. (X-post from r/dadjokes)
Both equally inefficient at letting me know when they are actually ready.
Oh baby, you are so (1/cos C)!!!
Because they drink it before it's cool.
Ch-ch-ch-ch-ch-cherry balm!
A gator-aid. Bet you did see that one coming:P
Because they're extinct