Look at the wine list for at least 5 minutes in complete silence, nodding and raising an eyebrow every so often so as to make it look like you've been impressed. Pick one that you're sure you can pronounce. Call the waiter over and ask 'How is your '94 [some wine] versus the '93 [some wine]?' This makes it look to others like you can actually tell the difference between vintages. Then, regardless of what the waiter says, say 'I'd like to try it.' (it being the cheaper one if you're paying or it being the expensive one if someone else is paying). When the waiter comes back and gives you a taste, take a medium-sized sip and keep it in your mouth while closing your eyes, swallow slowly and tell the waiter 'Yes my friend, this will do nicely.' This tells the womenfolk that you actually have a sincere interest in this crap and it makes the other guys think "hey, don't mess with this guy he really know his shit, even if it tastes like crap I'm going to pretend that I like it too so I don't look like a complete idiot."
Also, if another guy chooses the wine you must pretend that you like it even if you don't. Hey, he knows the rule and would do it for you." -Robs