It was supposed to be just another normal night sitting for some friends. Marge and Ken were due a night off and I had nothing on and so I volunteered to sit for them while they took off for a good night's fun.

Everything went fine. The kids had been fed by the time I got there and all I had to do was play with them for a while, dump them in the bath and then toss them into bed. (And clean up the bathroom. Have you seen what two toddlers can do to a bathroom?)

After the kids fell asleep I watched TV for a while. The usual...