Common sense, not so common!!!??!!

So Im laying in bed just relaxing and waking up from a fun evening with friends and I happen to glance over at the sprinkler on the ceiling of my hotel room and for the first time notice a warning sign on the ceiling next to it.

Now this just makes me wonder for a moment?  Why do they need to take the time to make sure no one tries to hang anything from a sprinkler?  Its because some time some where some fool actually thought it was a good idea to hang their jacket or pants or whatever from the sprinkler.  It just amazes me to think how many people go through life just oblivious and ignorant to common sense.