Excerpt from my student's essay, 'Describe a scene at a popular restaurant'

This student was describing how a trip to a popular restaurant was turning into a real nightmare. Which is fine. But see what he writes in this following paragraph...

When my friends returned from the toilet, things only got worse. It started when I ordered a plate of seafood noodles but the waiter returned with seafood soup. Then came the not-so-funny jokes from Tom. First, Tom added a piece of fat into his plate and said, 'Waiter! Waiter! There is a worm on my plate!'. 'It's fat, sir', replied the waiter. 'I can see that', said Tom. 'Its eaten all the food, that's why its so fat!'. The waiter then got so angry he started beating Tom with the piece of fat.