Mine is that you don't want to put your foot in the soft spot on a roof of a bar while being underage and trying to catch some of Michael Schenker's set via the skylight. Further, I most certainly do not recommend trying ease the tension with humor when talking to the burly bouncers who come up o said roof to see why there is water dripping on the keyboards. This is all doubly true if the owner of the bar has local mafia connections.