P

"p" was a video on the channel that was part of the second Reboot ARG. It was the second of two videos given out by the arginduol Twitter account after DMing it, the first being "o".

It was originally unlisted, but was later removed by YouTube for violating their policy on nudity/sexual content.

Content
The video is pretty much the same as "o", with the only difference being the different morse code:

"- ..--- -.... --... -....- -.... -.. .."

Which translates to:

"0267-6D19"

This is the second half of the  course ID seen in "o". After watching both videos one can piece together the full ID, 0F2A-0000-0267-6D19, which leads to the course Clear this Course! by Le Ruse Bird.

Hidden in the corner of the course are invisible blocks spelling "Steins;Gate", leading to the rip "Ringing -Reunion- - Steins;Gate".

Trivia

 * The title is likely referencing "Gangnam Style", since it combines with the other one, creating "op".
 * This video is in the  playlist.