Watering the trucks

"Now, we had to wash these big army trucks pretty often. The army likes to have things clean. So, you know, having to wash these trucks all the time got pretty boring. So what we'd do, is we'd fill up the tailpipe with water. Then, when we were ready to go, we'd get some poor sucker to go go back there. We'd tell him to check out the rear tires, or make sure that we picked up that one hose. We'd start up the truck, and all the water would rush back out of the tailpipe at once, and hit the guy. It was great fun. Now, there was this one day, it was real cold, and we'd washed the truck, and we're ready to go. So we tried to get somebody to go back there and check the tailpipe, but nobody would go, so we hopped in the truck to leave. Only, just as we're ready to start the truck up, this sergeant pulls into the stall next to ours. We can't tell him that we've been screwing around with the trucks, but he's right in the way of the water. So, we did the only thing we could. We all jumped into the cab, started the engine up, and drove off like nothing had happened. That poor guy got hit with the water right in the back, and I mean it was a cold day."