You can tune a guitar but you can't tuna fish.
The size of the tip.
Mick Jagger says 'Hey, you, get off of my cloud' The Scottish farmer says 'Hey, MacLeod, get off of my ewe'
Formed a coustic d'tat
An algorithm
Anyone can tuna piano, but nobody can piano a tuna!
You can tuna piano but you cannot piano a tuna.
BA-NA-NA-NAAA!!!!! (to the tune of Beethoven's 5th symphony)
A: You can tune the lawnmower and the owner's neighbors don't mind if you don't return the sax when you borrow it.