A week ago I rode my bike to work for the first time this year. It hurt and embarrassed me, so I thought I'd try again today. I went out to get my bike, and the rear tire was completely flat. Not "lost a little pressure sitting in the garage" flat, but completely, totally flat.
So I get to apply yet another patch to my rear tire. Sometimes it seems like I've spent more money on tubes and patches than the bike actually cost.