You just couldn’t do it. The beer was so awful, you puked on only the second one. Maybe the note was just messing with you so you drank that nastiness. There’s no such thing as a Zombie Horde, you hope.
Then they appeared. Lucky for you they’re slow, but you have nowhere to run, and no weapons. Or do you have a weapon?
You shake the remaining four beers and spray the Zombies. The Horde is no match for the awfulness you sprayed them with, and they all disintegrate.
You’re alive, for now, but sober.