I took this picture at the train station right next to our Palo Alto office. At first glance, I thought it was an unusual fashion statement, but then I realized that the woman in the picture solved a common problem in an elegant way: When your bike lacks a chain guard, your pants can easily get stuck and you risk destroying them—or even causing an accident. By wearing a cut-off sock above her pants she kept them protected from the chain. By going with a chartreuse sock, she made sure she wouldn't be overlooked in the aggressive Bay Area traffic.

Unfortunately, I discovered this helpful little hack the day after I ruined my favorite yellow pants with chain oil. But don't pity me too much; in the end my dry cleaner saved my day, and from now on, I'll always carry a cut-off sock with me.