Walk into their art booth and say at least one of the following:

• “Are these pitchers?!” or my personal favorite, “Are these real pitchers?”
• “Did you take all these?”
• “Did you fake this?”
• “Did you really go to these places?”
• “Where do you display your work?” (..said while standing inside my booth.)
• “Are all these for sale?”
• “Do you have these on your website?” (..I hadn’t thought of that)
• “Do you have any pieces by <somebody else>?”
• “Is this digital?” and then the inevitable, “Is this photoshopped?”, and then the inevitable, “Is this HDR?”
• “How long did it take you to set up this <found object sitting out in a field>?”
• “What camera do you use?” instantly followed up by, “ewwww! you use a [Canon / Nikon]! I use a [Nikon / Canon]! They’re sooo much better!”
• (Right after buying a print) — “This will look great once I turn it into a painting!”

Or just stroll into the booth, calmly pull out a camera and start taking photos of the images hanging on the wall. Seeing people do this just makes me want to carry a squirt gun filled with piping hot goat urine.