Because you have nothing else to do? I needed to document it for a friend who wanted to see the performance. There are other more scientific videos and not nearly my best work. You should see what I cut out. The outtakes are funny, but I had limited time to do it and get the cars washed.
FWIW I had never heard of a foam cannon before and in fact am still working on my technique.
If anybody is shopping for a new gasoline powered pressure washer there is no better deal anywhere. Subaru commercial grade motor with consumer grade 3100 psi pump for $189. Works great. Home Depot online only.