I've done it (tapped a keg right from the store last minute) and it worked out just fine. I use a 120 foot coil so I don't know if I'd have the same result with a shorter coil. I had the CO2 pressure at about 30 PSI.
If I remember correctly, we did get a little extra foam at first but it seemed to settle pretty quickly. No one cared because we were in the middle of a party and ran out of beer. Just about anthing other than pure foam would have worked for us at that point!
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