Make a mental note to stop doing so much acid.

Ask him to put a shirt on. Those are some serious man boobs.

What is it about him that identifies him as the Budha? Is he wearing a sandwich board, like those people outside tax offices early in the year? Is he walking up to people, "Hi. I'm Budha. How are you?" Is there a crowd around him, declaring him to be Budha? Wondering if my first reaction wouldn't be to question my sobriety.

Tell him to stay hydrated and to wear a hat.

Say hello?

Is he the fat one or the skinny one? If its the fat one, I would tell him a fart joke. If its the skinny one, I'd bagger him until he ate something.

"Whatever your conception is of the Buddha, it’s WRONG! Now kill that image and keep practicing. This all has to do with the idea that reality is an impermanent illusion. If you believe that you have a correct image of what it means to be Enlightened, then you need to throw out (kill) that image and keep meditating.

Most people have heard the first chapter of the Tao, “The Tao that can be named is not the eternal Tao.” (So if you think you see the real Tao, kill it and move on)."

stolen from the web somewhere

Plus one to @tnorman1236

Walk with him and see what he has to say. Ask questions.

Greet him, politely, ask after his health, give polite answers to anything he might have to say, then carry on.

Basically the same as I treat everyone I encounter.