Actually yesterday! We went on a hike Sunday, I packed my blackberry and pager in my day pack since I was on call technically. For what ever reason I took my thumb drive, external USB hard drive and headphones out of my pannier too. Needless to say I left home with out the thumb drive, hard drive, headphones, blackberry and pager, oh and my belt. This didn't occur to me until I was about 3/4 of a mile away from home.

The belt, phone, pager, and thumb drive I could do with out. Not having my music and headphones would probably drive me crazy. I turned around and sprinted back home and picked up the forgotten gear :>