Even though Sheldon and Howard consider each other friends, they have always had a bit of a contentious relationship.

On The Big Bang Theory season 7 episode 17, the truth comes out about why Sheldon takes every opportunity to demean Howard. It's quite funny, though at the same time Sheldon's irritation at his friend makes sense.

In order to heal their relationship, Howard invites Sheldon on a trip to Houston. Will Sheldon put his grudge aside?

Penny and Leonard also have some relationship trouble when she turns down an acting job and he doesn't understand why. She runs into some trouble and he helps her out in an unexpected way.

Speaking of help, Amy acts as a conduit between Raj and a potential girlfriend. It goes just about as well as you'd think.

Get ready to laugh and watch The Big Bang Theory online now to find out what happens!