Classic!
http://www.youtube.com/watch?v=gfJTXDppVNA
Lunk alarm: the alarm in Planet Fitness gyms that goes off when a
lifter tries to do stuff which is deemed "too hardcore" by fitness
spa goers such as grunting or putting down of weight not so
gently.
http://blog.news-record.com/staff/triaddiary/2007/12/the_lunk_alarm.shtml
omg, I had no idea planet fitness was such a retarded
gym. 
no excuse for the guy blowing his gasket and breaking stuff
though.