I have two lovely "infraction accusation" stories from my days as an active. Neither involved my chapter.
There was a particular chapter that would use glitter sprinkled on the floor as part of their decorations during the first round of recruitment (which was held in the student center). During that round, PNMs sat on the floor and watched a skit. Inevitably, glitter would cling to the PNMs' shorts, legs, and the soles of their shoes, and would get tracked out into the student center halls. Invariably, some other chapter tried to stick them with a violation for allowing their PNMs to take objects (i.e. said glitter) out of the rush room. Panhel had to hear the charge every year, but it was always found in favor of the "glitter chapter" - it's just glitter, for crying out loud.
(The sisters did vacuum the room and the immediate surroundings thoroughly after the parties were over for the day.)
We also had a work week, before the start of recruitment, during which wearing or displaying letters was strictly verboten. One year, during that week, a sister of ABC from my school saw someone out jogging in an XYZ shirt. So ABC brought XYZ up on charges. Of course, there are a LOT of colleges and universities in the Boston/Cambridge area, and many of them have greek systems, and old recruitment/party/event shirts make great workout clothes... you see where this is going - the XYZ in question was from a different school. The charges were dropped.