any time you are forced through social awkwardness to compliment or purchase art by an artist who you would not have appreciated otherwise.
artist- hey man,would you like to buy this limited edition collage postcard? its just $6. i just made it, y'know, with old national geographics on the ride here. i need money for a bus ticket to get back to idaho.
you- *pause* yeah uhhhhh sure man, thanks alot.