Myself and three friends were diving on the Missouri one Sunday afternoon, back when Martin of ADTC used to do a rib charter. It was a lovely summers day and the first pair entered the water closely followed by my buddy and I, we had a really good long dive with excellent vis and I was feeling really happy and a bit mischievous.
We returned back to the shot and I could see the first pair already 3/4 up the shot line, so I proceeded to vigorously ring the shot line like a church bell while doing Quazi Modo impressions through my reg, the pair looked down at me very puzzled, then came down ... only they weren't my friends from our boat
.. and it wasn't our shot line
... While we were down another boat had arrived and dropped another pair in, needless to say my cheeks were a little sun burned back on the boat.