At work, we were just locking up it was 2230 and me and another lifeguard were stood there talking about a story the maintenance guy told us. Apparantly he was there over night and hear a noise from the top floor so he checked it out and nothing was there and when he got back downstairs the lift activated and came down and open and an eggy smell came out. So just after i told my mate this the lift activated and opened!!! needless to say we ran!