Watch Jim Parsons Sings The Big Bang Theory Theme Song | Celebs

Do you know the theme song to your own show?

Our whole universe was in a hot, dense state.

Then nearly 14 million years ago.

Expansion started wait.

Wait.

The earth began to cool the autotrophs began to drool.

We built--

Neanderthals developed.

Neanderthals developed tools we built the wall

we built the pyramids.

Math, science, history, unraveling the mystery

it all started with a big bang.

Yay!

(upbeat music)