What do you do when you need some beer foam . . .

early in the morning?

This morning, I wanted a photo to illustrate a post (elsewhere) about what Stephen Colbert is calling "Thursday's post-racial beerfest".

Despite what you might think, I

1. did not have any recently used beer mugs lying around, and
2. was unwilling to pour a cold one before starting my work.

So what did I use? Baking soda and vinegar.

When it was through fizzing, I poured off the liquid and took a picture of the mug with the foam clinging to it.

I'd post it, but it was done for hire and doesn't belong to me.