Why Is It ?

Why is it when you finally have time to yourself to relax and catch up on a few things you want to do. Someone needs you in a life and death situation. Of course when you stop what you're doing and go over you find out they just wanted a ride somewhere. When that's done there's a few little things that have to be done and you get home about 4 hours later. Don't you just hate it when that happens? It seems like since I've gotten older it happens a lot more often and that's a bummer.