Backrolling into the water, I hate the sound of sudden freeflow (because no one wants their air wasted that way).
During a dive, I've been
- startled by dive buddies caught by surprise themselves (ex. I once had this dramatic moment of holding out my hand and finning after an assigned buddy who tumbled off during a drift dive even as she frantically searched for a reef hook in her bc pockets);
- occasionally appalled by DMs with strange ways (one had us finning against the current the entire dive and still we missed the site);
- and horrified by how a surge during a night dive (a storm was then whipping the surface) nearly slammed me into a bed of sea urchins (I had a vision of being a human pin cushion).
While waiting for my turn to get back on the boat, at different times, I've been spooked by: jelly fish, an anchor drop, propeller blades starting to turn.