I didn't mean to use Western Union for real! That site is dedicated to scamming people who scam
using Western Union, Moneygram, etc..
The important thing is that you don't send any money at all. All you're doing is forging receipts to make it look like you
have sent his money, and make him frustrated.
Waste his time, make him look out to be a gullible twat by sucking him in and making him do stuff, and covertly get as much info about himself that you can in the process.
Then print up any of his details, photos here and humiliate his ass off when it's all done and dusted.