"Leaving a Message"
This one will take quite a while and needs quite a lot of people but it is a reasonably funny practical joke.
What you need:
Half a day
A few volounteers
A mobile phone for each volounteer
A victim and their phone number
Difficulty Rating: 4/10
Choose a victim and get together some people. About every twenty minutes phone the victim (each time with a different phone) and say "Is this Joe Bloggs" You can change Joe Bloggs to any name you like. At last at the end of the day you make the last phone call to the victim and say "Hi! This is Joe Bloggs, do you have any messages for me?" Your victim will be a bit embarrassed and won't know what to say!
Important note: Do not phone on schedule your victim may work it out.
