Be careful what you say, folks. You never know who’s listening.

Some people learned this the hard way recently when Jimmy Kimmel set them up for failure. As part of a segment that aired Tuesday night on “Jimmy Kimmel Live!,” Nate Diaz sneaked up on unsuspecting Conor McGregor fans as they laid out why they think McGregor will defeat Diaz at UFC 202.

The reactions to seeing Diaz were priceless. Here are a few fans talking trash about how McGregor is going to pummel Diaz, and the next thing you know they’re staring Diaz right in the face.

That’ll certainly make you change your tune, no?