Former divisional CEO at the bank I used to work at did this (nuts)...........at least had the decency to stick the hair dryer under a towel around his waist though. :lol::lol:
That excessively loud throat clearing/ gobbing thing some blokes do in the showers
Sitting on benches between sets so no-one else can work in (whilst usually pissing about on a phone as already stated)
People - and it's usually women - on adjacent treadmills, walking slowly and chatting...