"The Big Bang Theory" got a big guest star Thursday night, in the form of renowned theoretical physicist Stephen Hawking.
In the episode — dubbed "The Hawking Excitation" — uber-nerd Sheldon Cooper (Jim Parsons) gets to meet his hero Hawking and attempts to dazzle Hawking with his scientific brilliance. Unfortunately, the theory he presents Hawking with doesn't exactly create a big bang — in fact, it falls rather flat.
Also read: "The Big Bang Theory": 100 Episodes of a Show No One Hates
Watch Sheldon get a reality check from a giant of the scientific world.