The other day I tripped, took a nice fall and hurt my knee (but saved the precious hands). It wasn’t until later in the day that I started laughing because I suddenly realized I had stumbled over the handicap ramp. (On a related note, I once saw an ad for a literary magazine that had a drawing of an old-fashioned iron with a slash through it — ie. “no irony”. I immediately thought “OK, there’s one magazine I’ll won’t bother sending my stuff to!”)