Basic concept is a bouncer, as shown below, but sized for adults.
Obviously, there’s a slight issue with a 6 foot baby having any sort of decent amount of bounce in a standard doorway. Ignoring this small detail, the doorway probably would break on me!
Fortunately, at the London Playground Party there’s a nicely padded giant climbing frame – just about ideal to hang such a device from. This also allows me to expand past the width of a standard doorway, which is probably just as well.
Just to prove this isn’t a new idea, here’s a few select images from the around the net. If you know of more images of adult bouncers please let me know. Obviously, child sized ones aren’t as interesting!