Last night I kegged two beers, a stout and an IPA. I had some people over today and wanted to serve those beers so I took some drastic measures. I have tried this before but over did it.
I kegged and sealed as normal and set at 10psi and left to chill overnight. This afternoon I set to 20psi and shook the keg for 60 seconds each. I basically rocked them back and forth on my knee. Nothing too vigorous.
The results were decent. I would say the beers were carbed to about 70% of what they normally would be. I think I'll keep this as a last resort option, but it's definitely viable if you are in a time crunch!