https://app.humanornot.ai/

This is pretty interesting and has been doing the rounds on socials for the last day or so. You'll get matched up with either another human or an AI bot and you have to figure out within two minutes which you're talking to.

I've just played a few rounds and it does seem quite clever - the AI bots introduce typos and do have quite human reactions - but they also seem free to end conversations early, which does mimic human behaviour, but it feels like every conversation ends a little too quickly. I won two rounds and lost one though, because I thought one AI bot was a human with loads of typos.