I got kicked out of one a few months back.  I had a 10 mile tempo scheduled and it had just snowed a decent amount so I decided to tag along with a friend so I could use the treadmill.  First thing the treadmill wouldn't go past 10mph so I wasn't even able to get to my tempo pace and after just 2 miles I was asked to leave.  I was intimidating the hams with my ability move like a human.