Volunteers testing out the mocked-up Space Cadets shuttle ended up being sick.

The testers struggled to cope with the bouncing movements of the fake spaceship, making producers feel even more confident that they will pull off the hoax.

A source told the Daily Star, "We tried it out last week and the take-off was so impressive that the passengers started getting motion sickness. They were throwing up everywhere even though they knew they hadn't left the ground. Hopefully the Cadets will feel the same way and will fall for it hook, line and sinker."