This is way to complicated to just say one beer. It depends on the mood, the company and the purpose. Are you ready to go down the drain, well most will do. Kilkenny is nice, but so is Palm, De Koninck or Irish Red. They are nice round beers with good flavor. If you are looking for quantity intake, you could go; Heineken, Stella Artois, or almost any German Pilzener. If you go for total annihilation I suggest Grolsh "the Cannon" or Delirium Tremulus.... nice taste with about 13% alcohol. And for dinner I suggest most Trappisten bier, beer brewn by monks. They didn't have women to distract them so they could focus on more important things.... a very fine tasting beer.
Just my tuppence worth.
Cheers