Going outside and seeing an empty bike rack that only a couple hours before seemed safe and secure to lock your bike up. sucks really really bad If somebody wants your bike bad enough they will probably figure out a way to go through the lock. I hate thieves and bike thieves especially. My latest bike isn't the most expensive 1200.00 but it is blingy All Carbon Fiber and i worked really hard to buy it . ive got a good lock. but i'm also investing in a satellite tracking device. so if the worst case scenario does happen and if somebody does take my bike. ill probably be able to recover it and hopefully the thief will reap some of the bad Karma he's sown.