Laurence Olivier is known to be a 50/50 introvert.
Before going on stage, he would put himself 4 hours in silence without talking with anyone.
Olivier said he threw up backstage before every performance. He asked his fellow actors not to look him into the eyes.
After the show, he would not interact with any other crew as well.
But this does not inhibit his acting.
impromptuz 
Bibu is known to be a 100 introvert.
Before going on stage, bibu would put herself 4 hours on bed with Mr. Chow
After the show, bibu would not interact with any other crew as well except Mr. Chow