Why?

I know that David being out of town has nothing really to do with anything in the house breaking down so how come both the shower and the dishwasher have broken in the last week?  Nothing has broken in months.  It was just waiting for him to go out of town.  On top of that Colin has locked himself in the bathroom upstairs and won't come out.  Not a bad strategy.  If I wasn't afraid the kids would burn down the house I would lock myself in the bathroom with a glass of wine, bubble bath, and a good book.