How does one do this?

[Ashura San]

[video=youtube;nLirg8KgYac]https://www.youtube.com/watch?v=nLirg8KgYac[/video]

Are these mods or something? How would I go about doing these? They look cool.

Also: @1:12 "Surfboard, Surfboard" XD a lot of you probably won't get that joke -.-

 

[Pumpkin Ninja]

Yep, they're mods, I don't know how to do it though. And you're right, I didn't get the joke.