My 7.5 mile commute became 22.5, after I forgot my house keys at work and had to go back for them. I'll have to use my lock as a reminder device for my keys... I'm not worried about it getting stolen at work, but if I have to use my keys to ride my bike in the morning then I won't leave without them.

I wasn't planning on a long ride but it worked out nice, my night at work was so bad I needed the extra time to decompress. It's interesting to be out for long enough to watch the traffic patterns change throughout the morning.