Pet Peaves in Mechanic's Lingo

What word(s)/term(s) do you guys constantly hear in the world of cars that just ruffles your feathers?

Mine is Valve Cover(s). They don't cover the valves, they cover the rockerarms! They're Rockerarm Covers! :banghead:

You are entitled to call them what you want, but they are valve covers. Technically, you may be correct, but go to Summitt, or a Mopar parts supplier and do a search for rocker arm covers, vs valve covers. Or rocker arm cover gaskets.

Just sayin... ;-)