1. Buy a disposable jumpsuit for around a £1 from all good industrial catalogues.

2. Make customized name badges and Ghostbusters badges.

3. Tape these to the jumpsuit in appropriate places.

4. Cover backpack with tin foil or another appropriate material.

5. Cut a suitable colour hosepipe to about 2 metres in length and attach one end to a suitable looking water pistol and the other end to the backpack using duck tape (you no have your Ghostbusters costume and Proton Pack).

6. Play the Ghostbusters theme tune when entering the party with 2 other friends and look smooth!