One mate couldn't come on a night out as he had "sun burnt eyeballs". The same friend also refused to by a round of drinks on a separate night out because he wasn't thirsty. We still give him abuse about it everytime we see him.
I managed a guy last year who regularly took a few days off (2 weeks with one bout?) with "I feel a bit tired and I've got the shits."; I began to worry about his health until I realised that this mysterious illness always popped up when we actually had work to do.
Fair play for picking an excuse that you don't really want to question though...
First rule of getting out of stuff is say it's a stomach ailment.
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Except he doesn't have a job, or any friends.
;0)