A signtist!
They're both experts at placing temporary crowns.
They found her Head & Shoulders in the glove compartment.
A master baiter
Flying a plane.
Put an apple on your head & stand still he'll Tell you.
A trip advisor.
A master master.
He fell into it.
Some sort of karate expert I can't even open a Cheetos bag.
A lion or a gerbil The lion, because by virtue of being a lion, a lion is an expert on lions.