I was rowing through the middle of a nearby lake, coming home from fishing. The lake is flat as glass, not a single wave but the ones I made. About 11 AM. I stopped for a second, because one of the oars popped out of its socket, and it was b*tch to fix.
Suddenly something bumped the boat from below, hard enough that I fell on my a$$ and the boat started rotating in place, until it was a$$ backwards.
After 3 seconds, there was the same dead stillness again, not a single wave.
The only non creepypasta’ey explanation I can think of is that there were divers in the lace who decided to f@#k with me.