Joe, that's 5 pints in 2 hands and not spilling a drop... i can't even carry 3 pints without spillage!
2 pints in one hand would probably be pushing it for me without spilling anything for me. But the ability to stack all those has to take some practice. Practice a bar surely has enjoyed as well as patrons.
Not to mention he's drinking some decent beer too (Stella Artois...erm, well at least that's what the cups say) and not some crap Lite beer either.