I have literally "swapped paint" and it scares the crap out of you. If it was one of those "racin' deals" and my fault I would try and find the guy later and apologize. I have also leaned on someone and its no big deal and I have actually stuck out an elbow so the hard parts don't touch. If someone is swapping paint on purpose, they are too close to getting tangled up which can only lead to a bad outcome. You end with with a bent or missing lever that you really need in the next corner!