Had a very nice example once where a certain car manufacturer operated a BA11 and a G159. The blip, BA11 in the flightplan, looked a bit slow so I queried the type. The answer came back, "One Eleven" and the sound of someone being thumped was audible before he released the Tx button. Then "Sorry, Gulfstream" Not a big problem at a UAC, but the wrong info would have been passed down the line. Could be fatal should anything have gone horribly wrong
Easy to fall into complacency.
Check, check, and check again if you have any doubts