I knew there would be some interesting answers to the question. 

And here they are... (Taken from Twitter responses and comments here.) 

The dude from the I'm A Mac commercials. (Justin Long.) 

A young James Stewart 

Denzel Washington. 

Noah Wyle. 

Ben Kingsley. (Dressed as Gandhi.) 

CNN already asked the question. (Darn!) 

Charlie Sheen. (My own first choice.) 

Jack Nicholson. (You can't handle the truth.) 

Alec Baldwin. (In his Jack Donaghy role.) 

Samuel Jackson. (John Travolta?) 

Christian Bale. 

Jack Benny. 

Jack Valenti. 

John Malkovich. 

John Cusack. 

Ewan MacGregor. 

Boris Karloff (Is it a vampire movie?) 

Justin Timberlake. 

Leonardo DiCaprio. 

Seth Rogen (as Woz). 

Keanu Reeves. (Laurence Fishburne as Woz? Agent Smith as Bill Gates? The Oracle as Jony Ive?) 

Ashton Kutcher. 

Richard Dreyfus. 

Ed Harris. 

Tom Hanks. 

Patrick Stewart. (With Data as Woz?) 

Fake Steve Jobs. (Good one!) 

Colin Farrell. 

It should be animated, by Pixar. (Good one!) 

Larry David. 

Bill Gates. (?) 

Ralph Fiennes in full-on sociopath mode. 

The guy who plays Hitler in all the Youtube videos. 

Johnny Depp. 

Robert Downey Jr 

Jason Statham. (Assuming it's a heist picture.) 

Benedict Cumberbatch. 

Humphrey Bogart in the Cain Mutiny. 

Tom Cruise.