Okay, you might think I'm a little nuts choosing Gene Wilder's Willy Wonka (Willy Wonka and the Chocolate Factory, 1971), but hear me out. First off, imagine what he'd bring! Every year Thanksgiving at my house includes the same old stuff: turkey, mashed potatoes, weird geen things, stuffing, you name it. Ah, but if Willy Wonka shows up, you just know he'd come with his latest and greatest piece of candy: a drink that makes you fly, an everlasting gobstopper (that could, quite possibly, include the entire meal) or even a few Oompa-Loompas to help out in the kitchen.
Sure, he'd act a little nutty and probably freak out a good amount of your family members (with his creepy words of wisdom and a smile that says, "Ya know, I was a serial killer in a past life), but it would be totally worth it for the treats and at least one Oompa-Loompa song. You could record the whole thing on your video camera and gather the family around the television during future Thanksgivings to re-live that special day when Willy Wonka showed up. "Hey, here's the part when Dad reached into Wonka's bag and pulled out a piece of never-been-tested candy that turned him into a giant turkey! Oh, the memories ...."