what is the funniest way i could exchange about 218 coins?

[Total LOLige]

Glue them to something like a car or a wall.

 

[SnipErlite]

Another vote for the swag bag thing...in classic robber striped jumper and mask (Y)

 

[DoomyMcDoom]

put 50 of them each into 4 condoms, and the other 18 into a dirty sock, and then cash them in that way... and get a friend to film it and post it to youtube, then link it.