Guessing the number (or just like an answer the question when it comes up) so it would would work like this:

Bot: "What number am I thinking of? 1-10 (Winner gets a [item]) (You have {x} tries.

And it will send it to the server randomly per hour, asking a variety of questions for a certain reward. And I think it would be best if it could be based on population for some, especially the number guesser. So people don't just wait until everyone has answered