I only watch Mythbusters when I have time, so I haven't seen every single episode. They showed Episode 1 of their supersized special tonight. One of the stories confirmed in this episode brought back memories of trying something similar.
The Myth (Confirmed)
Jet wash can toss a vehicle through the air when behind the plane
It reminded me of my experiences in the Caribbean driving a death trap of a car called a Hyundai Atos behind jets as they prepared to take off from the airport. We'd drive behind giant KLM's and Air France jets as well as the smaller American Airlines jets. Sand would blow everywhere and the car would rock. Obviously, we never went airborne. Tourists actually have fun getting sandblasted at the beach located at the end of the runway when they're hanging out at a bar called Sunset Beach Bar. Granted you're not as close as the taxi was in this Mythbusters episode.
If you ever go to St. Maarten, I highly recommend trying this out.
By the way, I still can't get over watching them blow up that cement mixer. Wow. They blew that thing all to hell. That was fun to watch over and over again.