Hate stickers full stop!!! Hubby however loves them and it drives me insane. He's had one on the back of his V8 I think it said V8 powered only milk & juice come in 2 litres. Wheels always put one of their stickers on the windscreen to advertise their business. When HE takes his car their he tells them to colour code their sticker or the missus will go off her head. However when I take my there I tell them they had better not put a sticker on my windscreen, I pay them for their service they don't pay me to advertise.
And if hubby buys a SAAS steering wheel or pretty much anything that comes with a sticker he chucks it in the engine bay on anything it will fit on and that is probably my biggest pet peeve. Best I seen was when he bought fusion speakers for our old magna and wanted to put the big arse fusion sticker in the middle of the back window lol needless to say he wasn't allowed
Also hate seeing UNIT stickers I'm at the point now I cringe when I see them.