Reader Leah of mommyish.net submitted this just last night, and it was so great I just had to post it today (even though I have other great submissions in my inbox!)
"Hey Billy Bob, what should we use as ornaments this year?"
"Hmmm... Besty Jo, what about these beer cans?"
"Billy Bob! We did that last year! We can't do it again until NEXT year!"
"Ok, I've got some extra cars in the yard here, why don't we use the headlights?"
"Or... THE WHEELS!"
"Oh Betsy Jo, I'm so glad your my wife/cousin!"