Charge Late Fees for Missed Appointments?

What do you do when clients don’t show up for scheduled appointment?  Rob May’s new doctor has a pretty good idea:

A few weeks ago I started going to a new doctor, and was made to sign a document explaining their late fee policy. It was unique. If you miss a scheduled visit, you are charged a $20 fee. If you are late by more than 10 minutes, that qualifies as a missed session. But the doctor's office doesn't keep the money. All money from late fees is donated to the local children's hospital.

I haven't missed a visit, but if I did, I can't imagine arguing with the penalty. I think it's brilliant. It turns the debate from a me vs. them fight for my money to a decision about whether to give money to a third party charity. In essence, it diffuses customer anger while still imposing a penalty. It reminds me that innovative solutions to business problems do exist, but they sometimes require you to step a little bit outside the lines of conventional wisdom.