The only time I've been accused of hacking was when I decided to play on a new server on Battlefield Bad Company 2, and accumulated 25 kills with 0 deaths while using a tank. It was not even 10 minutes into the match yet either. They didn't even check their logs, they just assumed I was aim-botting. Most of my kills weren't even direct hits, but splash damage.
In terms of tourney cigarettes (if this counts at all), when I was little and my sister and I used to play Perfect Dark, we'd always agree to each pick a few guns for a custom match. She'd always pick the laptop gun, find a dead end, throw one on the wall, and then use another while standing there. She used to call me a cheater when I'd use the FarSight to kill her in these situations.