Dreamed the audience was all mirrors

Last night I'm on stage at this club I don't recognize, and I finally get a laugh — but it bounces off the front row and everyone is just reflecting me back to me. I keep doing the set because that's what you do, but every punchline comes back at a half-second delay, like the room is one big slapback echo. Woke up feeling like I'd done a show where the only person who got the joke was the sound guy, who wasn't there.