Jogging Shoes

Deciding to take up jogging, the middle-aged man was astounded by the
wide selection of jogging shoes available at the local sports shoe
store. While trying on a basic pair of jogging shoe, he noticed a minor
feature and asked the clerk about it.

"What's this little pocket thing here on the side for?"

"Oh, that's to carry spare change so you can call your wife to come pick
you up when you've jogged too far."