The World's Most Effective Birth Control

I'm watching my cousin's children-- a 4 year-old girl and 18 month-old boy-- for 2 days. They were whiny and crabby and easy to get upset and frustrated... actually it was just the 4 year-old. Let me just say that after only a few hours, I was contemplating never ever ever having children! Once children get old enough to talk and get an attitude, they're not so cute and fun any more. But thankfully they're much better this morning after they've slept well. So I'd like to report that watching little kids for more than an hour (and sometimes less) is the most effective birth control out there! (My parents will be glad to hear that grandchildren are not in the near future).