Just then, I saw 20 heads bobbing in the water...

What a chilling sight.  Twenty heads, some torsos...  rolling up and down with the waves....  shudder.   The water had to have been 55 degrees, tops.  Nonetheless, the surfers were all having a whale of a time.  What was their porpoise?

This was just north of Santa Cruz, which apparently has surfing conditions par excellence...