I'm a pretty relaxed roller, so being in a "bad position" doesn't bother me much. the ones that really bother me are when some of the "chunkier" rollers do what I call "fat on me." Some mentioned previously when a really large guy has you in north/south and no matter where you turn there's fat on you. or side mount when the new heavier guy ignores the repeated instructions of "chest to chest, chest to chest.. NO! chest to CHEST........... that isn't your chest.." and just lays his gut on your head. It's really easy to get out of when they do this, but it's just so annoying. It reminds me of the movie "Along Came Polly" when ben stiller is trying to guard that really hairy guy in basketball. It's just not a pleasant situation to be in, especially if they don't have rash guards or undershirts and their gi gets a little loose..
ugh, I start shrimping/bumping automatically just thinking about it.