Holding your breath

[Frank_Stein]

stuff

Yeah, it doesn't need to be overly complicated or realistic and it's more about adding a mechanic that can be both useful and amusing.

That said, having situations where taking a breath backfires would always be amusing especially since this is supposed to be a poormans substitute to internals much like a zipgun to a revolver. Losing track of how long you held your breath and passing out meets that risk, but a rare and situational way to blow out your lungs would be funny.