We all like a little wager with our mates from time to time.

The odd pint gets passed around or you could end up footing the bill for a bite to eat.

But no light-hearted bet with a mate normally ends up going as far as this - after one Manchester United fan was forced to follow through on a bet he placed.

Taking to Twitter, Seamus Bannon posted that he would drink is own URINE should Louis van Gaal manage United in their Premier League game against Chelsea.

So frustrated by the Boxing Day defeat to Stoke, he was sure that Louis van Gaal was going to be axed as manager.

But he wasn't.

Louis van Gaal looks dejected
Oh dear: Van Gaal's (likely) reaction to seeing the video

Van Gaal took charge of United for the goalless draw against Chelsea and poor old Seamus was left pondering what to do.

Rather than just delete the tweet - which received a mere 28 retweets - he actually followed through with the task.

Moment of truth: Seamus downed his own wee

In the witness of his Liverpool-supporting mate, who confirmed on the video that the liquid in the glass was actually urine, he downed the drink.

Seamus, not appearing to massively regret the decision to go through with the challenge did describe the taste as "disgusting".

Perhaps, everything considered, he did learn a valuable lesson not to make outlandish predictions.