The Big Bang Theory 's Sheldon Cooper (played by Jim Parsons) saw his world changed for the better when met Amy Farrah Fowler (Mayim Bialik) on a blind date way back in season three. The two went on to have one of the sweetest, most frustrating and hilarious romance on TV, cementing them as fan-favourites among CBS and Channel 4 viewers along the way.

However, one eagle-eyed fan has pointed out a rather clear plot hole with the pair's relationship.

The Big Bang fan took issue with the 'relationship agreement' Sheldon holds in such regard.

Over the course of their relationship on the show, the weighty document Sheldon would often produce in order to get his way was the source of plenty of laughs.

It was also the source of much frustration for Amy who would find herself trumped by a clause implemented by her boyfriend.

READ MORE: Big Bang Theory plot hole: Fans uncover huge elevator error