I've used TKW a few times and it's such a joy to use. The delayed gratification of knowing that the first two cards have arrived (a week apart) and then waiting for that last one to land is quite fun. Then it's a joy to hear from the target that they just found out it was me.

Almost everyone that receives one is on edge at first, thinking it is a scam or another "I'd like to buy your house in cash$$", so I've been working on ways to make it more personal. For example, addressing someone by a nickname or spelling variant that would only make sense to them.

My wife just tried it out too and set the whole thing up in under 4 minutes. Their friend just received the final one and came up to us to talk about it a few days ago.