They come in the middle of the night, open your tank and take your gas.
It didn't happen to us (I don't think) but it might have. My dad noticed half of our tank was gone one time but maybe it was his memory.
Our driveway has a motion censored light which is so bright it gives you a tan when you walk in front of it. So as soon as it goes off, I'm up and ready to defend.
Hope these punks can be caught!