can you mention a few of his movies?
"Rabbit Test", "rockumentary""This is Spinal Trap", "Mime is Money", "The Princess Bride", "Running Scared", "Miracle max", "When Harry Met Sally...', and others.
Billy Crystal
Crystal's first film role was in Joan Rivers' 1978 film "Rabbit Test", the story of the "world's first pregnant man."

Crystal appeared briefly in the Rob Reiner "rockumentary" "This Is Spinal Tap" (1984) as Morty The Mime, a waiter dressed as a mime at one of Spinal Tap's parties. He shared the scene with a then-unknown, non-speaking Dana Carvey, stating famously that "Mime is money." He later starred in the action comedy "Running Scared" (1986) and was directed by Reiner again in "The Princess Bride" (1987), in a comedic supporting role as "Miracle Max". Reiner got Crystal to accept the part by saying, "How would you like to play Mel Brooks?" Reiner also allowed Crystal to ad-lib, and his parting shot, "Have fun storming the castle!" is a frequently-quoted line.

Reiner directed Crystal for a third time in the romantic comedy "When Harry Met Sally..." 
who does mike's voice in monsters inc Billy Crystal. who are the other characters in it? Henry J. Waternoose III, James P. "Sulley", a small girl, Celia Mae and others. where is the above voice artist from? He was initially raised in The Bronx..
wiki:1540653
Billy Crystal [SEP] Film career
Crystal's first film role was in Joan Rivers' 1978 film "Rabbit Test", the story of the "world's first pregnant man." Crystal appeared briefly in the Rob Reiner "rockumentary" "This Is Spinal Tap" (1984) as Morty The Mime, a waiter dressed as a mime at one of Spinal Tap's parties. He shared the scene with a then-unknown, non-speaking Dana Carvey, stating famously that "Mime is money." He later starred in the action comedy "Running Scared" (1986) and was directed by Reiner again in "The Princess Bride" (1987), in a comedic supporting role as "Miracle Max". Reiner got Crystal to accept the part by saying, "How would you like to play Mel Brooks?" Reiner also allowed Crystal to ad-lib, and his parting shot, "Have fun storming the castle!" is a frequently-quoted line.