The worst is when they get worn in the year and you can see butt crack.

I will freely admit that happened to me. It was the first day of Cycle Oregon, 2002. A woman was riding behind me. She tactfully said "Those shorts must be very old." I told her they were, but for the life of me I couldn't figure out how she could know that. A couple of minutes later I got a sinking feeling in my heart. After I showered and changed, I stretched the shorts out with my hands. Into the trash they went.

Since then, I have done my civic duty by letting other cyclists know it's time for new shorts. They have always been appreciative.