Ah, that's why.

Today during body conditioning class (weights), the coach walks over to me and asks me if I'm doing alright.  Ya, I tell him, and ask how he is return.  He's fine, and am I really okay?  Catching a glance at myself in the mirror, I'm reminded how red I am.  Since he didn't see me before class started, I know he doesn't know it's a sunburn.  I smile and tell him, "Yes, just got myself a nice sunburn this weekend."  His stance relaxes a bit and the conversation turns to the last baseball game.  :)  Nice man.