I know that that "Scientists for a Better PCR" thing is really just an ad for Bio-Rad, but it's still one of my favorite things on YouTube.

I show it to my students once in a while, though I realize it kind of dates me, because it's a take-off of We Are The World, which was produced around about 1985, which is (gasp) well before many of the students I have (especially in my non-majors class) were born. (Though I suppose it's still occasionally shown on the music video channels?)

I find this parody fun partly because of the fun of guessing who the people are supposed to represent. I can pick out people who are supposed to be:

Lionel Richie (I THINK that's who the first African American guy is supposed to be, but he doesn't look much like him. Sounds more like him than he does like Michael Jackson, though)
Willie Nelson ("You had to grow tons and tons of tiny cells" Hah, I love that line and the way he delivers it)
Madonna (?) (The blonde in the cowboy hat - or is she supposed to be Stevie Nicks - was Stevie Nicks even in the original? She does look more like Nicks than Madonna, even Madonna circa 1985.)
Bob Dylan
Whitney Houston
Aretha Franklin (maybe, I don't know)
Simon and Garfunkel
Quincy Jones (I think that's who the African American guy in the sunglasses and vest is supposed to be, rather than Stevie Wonder. He acts/sounds more like Jones to me)
Huey Lewis

I always crack up when the guy kisses the PCR at the end. Though I suppose there are some lab-types who feel that grateful for their modern technology.