Guinness - Fickle Mistress

Here's a pint of Guinness, featuring my thumb.

I arrived at a startling truth as I drank this pint, my third, on Saturday. You get three, at a push four, gulps of a Guinness before it goes well and truly off. You have about ten minutes per pint. 

Or, to simplfy:

H \psi(t)\rang = E |\psi(t)\rang

You see older guys opening the gullet and downing pints. I'd always assumed they were alcoholics. Well, they probably were but this great truth was not lost on them.

That's why I get so drunk on the stuff. That's why it fucks me up so much the next day. It's not going off in the glass. It's going off in me!