Wait till he tries to stop with the wet brakes.
Anyone remember or still have the Ford P-1000's in their building? I think it was commonplace for most of them to start with the number "116"? We just got rid of the last of them that we had in our building because their brakes weren't very useful when wet.
One of my personal vehicles is a 43 year old car that has manual brakes so I know what it is not to have responsive braking, but some of these trucks took it to a whole new level. They had great power-steering, a great turning radius, a low step, very quick, fuel efficient, and my favorite was the pull-tab parking brake that is so much easier than a handbrake, yet anytime it rained, it was a day of downshifting just to be safe because the brakes were garbage when there was a decent amount of rain falling.