This Week in Viral Videos: Neil Young Sings ‘Party in the USA’ and More

This week saw a variety of viral videos, from a nostalgic flip book to celebrity cameo appearances ... even ninja references. (hi-yah!)

Leading the bunch is the 'Late Night' video of Jimmy Fallon singing Miley Cyrus' 'Party in the USA,' using a distinct, perfected impersonation. We realize nothing could beat the all-too-catchy original, but this version is pretty good competition.

See what other viral videos we picked as our favorites this week.

Neil Young with Crosby and Nash: Party in the USA

Flipbook Animation: Sonic the Hedgehog

Greatest Homeless Man Sign

Between Two Ferns with Zach Galifianakis: Will Farrell

Cat Mom Hugs Baby Kitten

Amy Poehler at Harvard College Class Day

Super Beagle

Ninja Warrior Birthday Party!

Time Lapse: Puppy to Adult in 40 seconds

Chill Out, TNT Camera Guy