Raspberry

fart fan

A ceiling fan in a bathroom

fart in a windstorm

Something utterly insignificant, ineffective, or fleeting.

fart in an elevator

Something proverbially unpopular or useless.

mare's fart

Something of no value, importance, or consequence whatsoever; a thing utterly not cared about.

old fart

An elderly person, especially one who holds old-fashioned views.