Found the kids playing with a seemingly dead bumble bee on the balcony. The weather was cold and wet so it was in a bad shape. I put it under my USB microscope to show them what it looked like close up. After a couple of minutes under the LEDS of the microscope it started moving rythmicly and all of a sudden a stinger popped out. I've always wondered if bumble bees can sting, now I'll treat them with more respect.