Here are some ideas of bots and what one could use to create them.
A bot that when given an operation it solves it. e.g.
4*10
the bot should respond
40
if the mesage does not match <number><operation><number> then it should say:
I am sorry <username>, I cannot calculate that :(
Have the bot ask a question. e.g.
How old is the Python programming language?
then using Kik keyboard or Telegram Keyboards one can provide the answer options. e.g.
"options":["2 years", "8 years", "12 years", "26 years"]
It will ask the question until you get it correctly.
Advanced version, will ask new question when you get this one correctly.
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What else would you do with a chat bot?