J^e's guide to a fun night in with AIM:

1. Choose a random target by whatever whim takes you. Picking a mind-numbingly mainstream music group is a good way to start if you're stuck.
   
2. Message them with: "Hi! Guess who! ;-)"
   
3. Let them tell you who you are. Revel in your new identity.
   
4. Alternatively, pretend to be an acquaintance of that person. Bag the person a lot.
   
5. Carry on the farce as long as possible. Don't just be passive either, take the conversation forward. "Are you still with that blonde?" is a nice line to use.
   
6. For maximum amusement value, do the above with a friend. Compare notes.