Hand waving carbonation testing techniques?

Does anyone have any handwaving type of carbonation checking techniques for their bottles of beer? Giving them a good shake shows me that they've actually started to carbonate. :fro:

huh? I knew my s*$# wasn't done, but Im out of commercial brew so I had two anyway

Some people fill a plastic bottle or two and use them as carbonation guides. More squeeze than waving.

I prefer the old fashioned method:

1. Open up a bottle. Be disappointed by the weak "pfft". Pour it and hope for some head. After the wife says no, drink the beer and be disgusted by how flat it is. The realize that you bottled it that afternoon.

2. Open up a bottle a week later. Be happy that it has some foam on it. Drink it, then decide to wait.

3. Open up a bottle, find out its perfect. Put four in the fridge, finish them before the fourth is even cool.

4. Start brewing a new batch. Stop paying attention to the last batch and focus on the new batch. Repeat step one, but this time add an argument with the wife.

Lol, cheesefood. I'm sure thats how I'll end up doing it, minus the arguments with a wife.