I worked on this a bit, as a joke. A sex doll, in a box, with a small helium tank.

I wanted a friend to open the box, be scared by the air/hissing sound, back away, and before he could react?

Sex doll floats to the 12 foot ceiling in his office.

I had issues with the trigger, it deploying correctly, tried it a dozen times and gave up.

My other concern was it mistakely deploying while in transit with the post office.