Things happen in 3

I find this so true. I always tell people, "Well, that was number 2, I'm just waiting for 3 to happen." People just usually dismiss me and say that it's a bunch of hogwash but I truly believe this. Maybe if I didn't believe this so much it wouldn't happen? I don't think so though! So, my question is does good things happen in threes also or is it just the bad things?

1) My cat gets plugged and it costs almost $500.00.
2) My daughter wakes my husband and me up at 7am to tell us our car is smoking, antifreeze is running everywhere, the battery is dead, and the steering doesn't work! That cost us $400.00
3) Came home to our renter's room flooded. This usually happens if the main drain gets clogged and someone does a large load of clothes. NOPE, this time it came in from the OUTSIDE. Yep, the mudroom had an inch thick of water in it and it leaked into his room. UGH.

Ok, so these things could be fixed and have been fixed but why does it always happen in threes?