Sometimes they can be a nuisance when one hooks on another when I blink. There is this one on my left eye that sort of sticks down rather than curl up like the rest. It catches on other eyelashes or annoys me hanging down in my front of my eye.
Once when I was about 5, my brother and some neighbors were lifting weights in the basement. I tried to squeeze between whoever was lifting and the ping-pong table. The end of the barbell took out a few eyelashes I think. There was a little blood.