davywavy | A fun practical joke

You will need...

A medical biohazard waste disposal bag
A sheeps brain
Two white lab coats
A warning siren or bell (small)
A lot of clear gel

We planned to do this as students, but never got round to it (for various reasons I had all the above in my flat at one time, and we were just going to put them together.)

Carry bag full of gel with sheeps brain in it through centre of town. Set off warning siren. Look at bag in horror, drop it, and then run like hell as fast as you can, preferably with an expression of horror on your face.

Watch reaction.