I don't mind if someone wants to ask if they can work in a set between mine, which actually hasn't happened to often. It does bother me when someone thinks that by putting a towel on a machine, that no one else is allowed to touch it until they decide they will come back to it. I have seen this happen more then once and more then once I have moved a towel to use the machine. I even had one young kid come back over during my second set and point to his bag and towel sitting beside the machine and saying "that's my stuff". I just replied with "Oh" and continued with my sets. To people like this, I will NOT give in. I doubt if anyone would even read "gym etiquette" if it were posted on the walls.