I received a call the other day from a member of my fraternity who I might see once a year at an alumni event. Other than the interactions we shared while I was chapter president, we never talked a lot. Certainly never got close enough to discuss women, feelings or the future. To be honest, he's a bit odd. On his call to me he told me that he'd always respected me, looked up to me, other nice complementary things, which I appreciated, but then he sprang a big one on me - he asked if I would serve as a groomsman at his upcoming wedding in June. I'd received a verbal invite to the wedding and had considered going but certainly hadn't mentally committed. I would never have imagined I'd be asked. He insinuated his fiancÃe wanted to add another girl to her side so he needed another guy, and I think he's actually out of options, so came to me. I would have to pay to rent a terrible tux, likely with some brutal turquoise cummerbund or something, and possibly participate in the stag, which will not involve much drinking or going to Vegas or anything normal, unfortunately. I've asked a few people what to do, but I'm thinking I could politely decline and say that after consideration I think it would be appropriate if he picked someone he was closer with to be there on his big day, and that I don't think I'm worthy, and all that. Or do I need to suck it up and just do it? What's the etiquette and exit here?