NrG drink is an energy drink with extreme effect and an option in Escaping the Prison. It is one of the six items hidden inside the cake that Henry receives at the start of the game.
After Henry drinks the drink, his head starts throbbing and his heart beat increases. He throws the empty bottle backwards only for it to stop in midair. He pushes open one of the cell bars with his finger (having had him become so fast time stopped around him and everything can be bent to his will) and Henry nonchalantly walks out of the prison, throwing the guard that said he is free in the trash can and picking up a donut along the way. When Henry exits the prison, he has a heart attack and dies, leading to a fail. This is due to many side effects of the drink, described in fail screen transcript.
Fail Screen Transcript
NrG- Side Effects include: Nausea, Headaches, Rapid Heartbeat, and possiblities of Stroke and/ or Heart Attack. Hmm... Well that's good to know.
Click on the boss' donut before Henry grabs it, and it will say DONUT +1. That's one of 7 donuts in game that can be found to earn the medal Donut Want.