Here's another good one.
You will need four volunteers. Sit on the ground and get them to try and pick you up sbove head height - it will be a struggle.
Now tell them they are going to pick you up using only two fingers each. Show them how to clasp their hands together, fingers intertwined, with forefingers outstretched.
Sit back down on the ground, and make yourself into a ball, bum flat on the ground, arms around your legs. Get your four volunteers to stand two either side of you, stack their hands on your head, and press down with a firm pressure - they need to do this for about a minute or so.
Now your volunteers need to clasp their hands together as shown. Using their outstretched fingers, each of them needs to take a 'corner', under your knees and under your armpits. Get them to pick you up on three.
Crap yourself as they launch you into the air.