When fish get silly and scare you.
one of my pepper cories decided it likes the new oto tankmates, and tried to immitate one. It half stuck to the glass, head up, and fell asleep.
so i walk in, see this motionless cory, seemingly half floating upside down, as it's head was pointing up, drifting with the filter current.
i go " OHHHHH NOOOOOO"
i guess i woke it up, or the current pushed it enough, as it woke up and swam off.....
also my betta has learned to jump the breeder net i got it as a "time out tank" for feeding the rest of the tank.. what a freaking PIG