Yesterday morning in the office:
Joe: "Hey, are you coming to pub this evening after work for a quick drink?"
Me: "I can't tonight. I'm going scuba diving"
** blank stares and looks of disbelief from around the office **
Me: "Honestly. I know it sounds like a lame exuse, but I AM going scuba diving"
Joe: "Ok. I'll be down the pub for a few, as soon as I finish my rock climbing class"