"Shouldn't" happen if you have check valves in the line.
36/36 has worked reasonably well for me in the past when I'm in a hurry but nothing gets it fully carbed like time.
@Steve rolling and shaking works if you're in a big hurry and with experience it's reasonably safe but also a good way to overcarb if you're not careful. I'm skeptical re the workout claims. Either way it will still be better carbed in a couple weeks, with regard to mouthfeel and that carbonic bite mentioned above.