Because they have a hard time puckering their lips the right way.
If they are thick, they have a hard time to rise
They both have a hard time pulling off a twist.
The best joke I've ever heard!
They say the business is toast.
She only puckers up for her pacifier.
The specific ocean.
A cow with no lips.
Because dogs can't whistle. (X-post from r/dadjokes)