Funny, I've always said that there is no bad advertising media, just bad advertising ideas.
"What about parking tickets? That's a bad media! Nobody looks at the back of them!" one of my pals has always insisted.

Well, pal, check out this clever taster from BBDO Germany where they made the parking tickets mint flavoured to announce the Wrigley's new fresh mint gum and get back to me.
Not a bad media, great idea. Very clever.

BBDO Germany