Top Videos: Halle Berry's Hamster Roll, Game of Thrones Meets Sin City

This week, The Tonight Show bestowed upon us a Crosby, Stills, Nash & Young cover of Iggy Azalea's "Fancy," as well as Jimmy Fallon and Halle Berry's human hamster roll. Also, Jim Gaffigan guest-starred in the new web series "Teachers Lounge," and Mystery Girls stars Jennie Garth and Tori Spelling took a pop quiz about their days on Beverly Hills, 90210. And the Internet memorialized Brett Bunsen, who has been shot a total of nine times on Archer. Check out those clips and more in our weekly roundup of the best online videos:

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 Jimmy and Halle's human hamster roll: Visiting The Tonight Show to promote her new CBS show Extant, Halle Berry proved she's up for anything by participating in a "human hamster roll" with Jimmy Fallon. Can this be an Olympic sport?

CSNY's "Fancy": David Crosby, Stephen Stills and Graham Nash also stopped by The Tonight Show this week, and were joined by a, ahem, special guest (wink, wink) — their CSNY bandmate Neil Young. Together, they all performed a folk version of Iggy Azalea's "Fancy."

YouTube introduces 48- and 60-FPS videos: Over the next few months, YouTube will begin to showcase more videos in 48 or 60 frames per second (a.k.a. a higher quality), which is particularly good news for gamers. Check out one of the early examples — the trailer for the upcoming videogame "Battlefield: Hardline." (via Tubefilter)

Teachers Lounge: After a successful Kickstarter campaign, the fledgling website SnagFilms' Thundershorts unveiled its new comedy series Teachers Lounge this week. Comedian Jim Gaffigan stars in the first episode as a school nutritionist who runs an oddly-named wine company in addition to his day job. (via Tubefilter)

Jennie Garth and Tori Spelling revisit Beverly Hills: Former Beverly Hills, 90210 co-stars recently stopped by the TVGuide.com offices to chat about their new show, Mystery Girls. We couldn't let them leave without taking a little trip down memory lane, so we gave them a little pop quiz. Their task? Put Kelly and Donna's boyfriends in chronological order. Watch the results below — and witness the embarrassing moment when Garth reveals that she had no idea Kelly ended up with Dylan, not Brandon.

Brett getting shot on Archer: R.I.P. Brett Bunsen, the ISIS employee who always seems to find himself in the wrong place at the wrong time on FX's Archer. Brett was finally felled by a bullet to the head in the Season 5 premiere, but only after getting shot a whopping eight previous times. This supercut looks back at his finest most painful moments.

Game of Thrones meets Sin City: Is Westeros the new Sin City? It just might be, if this mashup trailer is any indication.