Here is a collection of the best April Fools Day 2012 Videos. Let me know if I've missed any! First, let's start with a little educational video:

Google

Don't forget to blow the catridge!

So many boxes...

Google's jokes are so realistic, I'm glad they put so much time and money into this.

Gag Products

I could actually see this selling...

I want this.

Yet another gag product that we'll likely have within the next few decades

Seemed pretty legit, till about 3/4 of the way through...

"There's a pony in every corner now..."

Google - Really Advanced Search - You can also tickle a unicorn!
Google - Click to Teleport - Maybe someday...
CatBlock - A rather large following wants to preserve this functionality. I might get adblock now.
Guild Wars Skill Changes - "Thunder, Thunder, Thunderclap! HOOOOOOOO!"
Blizzard Prank Games - LOL that was easily the most difficult demo ever.
Bethesda Forums now with 100% more ponies! - Needs moar Bidoof