In The Big Bang Theory there are no better friends than Howard Wolowitz and Raj Koothrappali.
The engineer and astrophysicist are almost inseparable in the first couple of seasons of the show. Raj struggles to talk to women whilst Howard's pick up lines never go the way he plans.
Things between the pair begin the change when Howard meets his perfect women, Bernadette. When the couple get married and start a family Raj notices that Howard has been taking their friendship for granted.
It takes a while but the pair manage to work through their problems, proving that their friendship was built to last.
How much do you know about these two best friends from The Big Bang Theory? We've found some of the best quotes from Howard Wolowitz and Raj Koothrappali, all you need to do is work out which of the pair said it.
Can you remember who said they can't look at a pickled herring without feeling aroused? Do you know which of the pair said Aquaman sucks? Only the biggest fans of The Big Bang Theory will be able to get 100% on this ultimate Raj and Howard quiz. Let's see how many quotes you can correctly identify!
Don't forget, all the answers can be found at the end of the quiz.