I'll go first (duh)
One time, I was sitting on the toilet doing the doo doo and a spider came from the ceiling right in front of me, I wasn't even done and I didn't have anything to kill it with so I grabbed a stepping stool and smashed it into the ground and killed it.
Now it's your turn.
Edit: Baby Spiders hatched Inside my ceiling fan and invaded my room, needless to say I slept on the couch that day.
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Every 10 or 17 years in Maryland we get a huge mass of cicadas which are these huge flying like grasshopper looking things. And when I say huge mass I mean like millions of the -blam!-ers everywhere. This happend to me when I was in daycare when I was like 5 and they just kept landing on me and they were the nastiest things ever.