I don't think Weasel Stomping Day is actually real. Or at least last I checked. If you want an example of "annual traditions", check out the Simpsons episode "Whacking Day" where they club snakes every year.
I don't think I've seen that one. I'll look it up later on. The only thing Britney Spears related was when she, Jessica Simpson, Ashley Simpson, Avril Lavigne...and I think there are a few more, challenged N'Sync.
Oh yeah I loved that one. Care Bears was a childhood favorite of mine.
Have you seen the celebrity rehab invasion one where their lizarRAB. I especially loved Britney's kid falling out of the plane (cause she rode with him on her lap) and Paris Hilton getting her neck snapped by Barbara Bush. My sense of humor is just so wrong.