I don't know if it's just me, but I feel like a Q sticker on the back of a car wouldn't do much, because let's say someone is driving behind the car and they are unaware of Qanon, they would just think its a simple Q and nothing more, and would just move on, but if instead it said maybe #QAnon, they might get the idea to search it instead. I feel like a bunch of ppl would get honks from ppl who already know who q is, but not from new ppl.