Don't know how old this is, but..

[the4thImpulse]

1. Go to Youtube.
2. Type in your favorite ponies name.
3. Look at Youtube's search bar.

[TWILICORN]

They added it in the middle of geek week I think.
Search dj pon3 rather then Vinyl Scratch

[JSynth]

It works for Lyra.
Which was actually a surprise for me. I thought it would be for the mane six.

[Ed Viper]

Aww it doesn't do it anymore.

Old thread, but seeing this reminded me of it and when I tried it it didn't work.

Sads.

[ExoBassTix]

Awe shucks. This was my only reason to still like YouTube ;_;