ONOMATOPOEIA
A pun on the two meanings of "quack": 1) the sound a duck makes 2) (informal, disapproving) a person who dishonestly claims to have medical knowledge or skills (cf. German "Quacksalber")
And now a "quack" cartoon:
THE BOTTOM LINE THE BOTTOM LINE THE BOTTOM LINE THE BOTTOM LINE THE BOTTOM LINE THE BOTTOM LINE THE BOTTOM LINE