The Big Bang Theory Quiz: Who Said It - Sheldon, Leonard, Raj Or Howard?

Thanks to four of its stars, The Big Bang Theory made being a geek cool.

Sheldon Cooper, Leonard Hofstadter, Raj Koothrappali and Howard Wolowitz all loved different aspects of science. Leonard and Sheldon loved physics, Howard got his hands dirty in engineering, and Raj was an astrophysicist. The Big Bang Theory helped many fans learn all about science. For example, how many of us had never heard of "Schrödinger's cat" until the guys explained it to us?

The gang don't just have their love of science in common, though, as the four friends love comic books, sci-fi and the renaissance fair. From desperately trying to get Comic Con tickets, to sharing in the purchase of a Time Machine on eBay, the four always understood each others' love for all things nerdy.

Can you remember all the quotes by scientist friends Sheldon, Leonard, Raj and Howard? This quiz features the four co-workers' best quotes, and all you need to do is decide who said each of these lines of dialogue?

Do you know whose mother had them tested? Can you recall who it was that said they ate a butterfly? This quiz will test even the ultimate fan of The Big Bang Theory. Let's see if you can correctly identify all 12 of these quotes!

Answers at the end!