Contestants have been challenged to avoid laughing over the next two days, with obstacles in their way to amuse them.
Earlier this afternoon, Arron was made to wear a bird costume, but it seemed contestants held their composure.
However, Big Brother has now raised the stakes by giving all housemates electric shocks to see whether any chortles can be burst from them.
If the 16 contestants collectively laugh more times than the number predicted by Big Brother in a sealed envelope, they will fail the task and have to deal with budget shopping for the week.
Big Brother continues tonight at 10pm on Channel 5.