The past couple of years we've played the odd friendly against the likes of Alfreton Town, where you can not only buy a pint in the ground but take it back in to the terrace and watch the match while supping.
Unfortunately, as previously pointed out the minority of morons stop this from happening at "real" games. I remember my first ever visit to Fir Park, and I asked them which beers they were serving, cue the confused looks