Jack's acting technique?
Check out his quote.
"I am particularly susceptible to the parts I play... If my character was having a nervous breakdown, I started to have one".
Was this a tongue-in-cheek quote or is it really how he approached a role? Was Jack ever "over powered" by his acting to the point where he brought all of that energy home with him at the end of the day or was he able to leave it at work?