We've had a few sightings lately - last weekend a few of us were w/surfing off a local spot and there was a small group of birds hanging around one spot. As I cruised past I saw something hit the surface & make a decent splash (from experience, wasn't a dolphin, seal or whale - I know what they look like).
Anyways, the wind was too good to leave, and although I thought I should warn the others (had a strong feeling it was a noah), I didn't want to finish the day on the water by myself...for obvious reasons! Best I could come up with was telling the guys "hey, you see those birds circling over there...best to stay away from them, or at least try not to fall in near them". The birds hung around right where we were (attempting) gybing out the back.
When we were all out of the water I told them why...