Linux is to blame
Nah, he's actually doing about 35mph. The reason the speedo says 189 is that it is running Linux and there is a bug in the billion line bloated software app that measures the speed. The bug got introduced because the author also decided to make the program calculate how long it takes a cup of tea to brew and he miscalculated somewhere.
Don't worry, I hear that my 12 year old neighbour is working on a patch that he will submit next week when he has finished his woodwork project. You'll be able to download the patch from www.nogirlfriend.com