What If - a sentimental web comic - by Julieclipse, 24 July 2003 - thanks to Vruba and Platypus for their admirable examples
Eclipse: What if you're dreaming? Platty: What do you mean?
Eclipse: I mean, right now, everything you see and hear and feel could be solely the creation of your brain.
Eclipse: How would you tell?
Platty: I have a better question: what would you do?
Eclipse: You could do anything, once you knew. Platty: So try to do something 'impossible.' If it works, then you're dreaming.
Eclipse: Well, try something impossible, right now, just in case. Platty: Okay. What would you do if you could do anything?
Eclipse: Right now... Eclipse: ... Eclipse (typing into a laptop): I'd talk to you without this damn screen in the way. Platty (typing into a laptop): Hey...
Both (together IRL): Maybe you're dreaming, after all.