People sitting on the treadmill reading a book
seen plenty of them, I've seen this one guy who would come in all "geared" up (cloth wise) gloves, power lifter belt, Lifting shoes, Pitbull Gym shirt... he would walk on the treadmill for 15 min (warmup) than do some pushups than talk to the other no good guys for ages and walk off
post some of your more amusing Gym Tourists stories.