Crash Dance

The  Crash Dance happens in Crash Bandicoot 2: Cortex Strikes Back and Crash Bandicoot 3: Warped whenever Crash gets or finds a gem and arrives in the warp room. He also does it when he wins a race in Crash Team Racing and Crash Nitro Kart. At the end of Crash Twinsanity, his nemesis Dr. Neo Cortex ends up in Crash's brain after a scheme backfired, and was surrounded by miniature versions of Crash, all of whom proceeded to perform the Crash Dance with the poor doctor grabbing his hair screaming. The dance also appeared in the Japanese version of Crash Tag Team Racing, and all versions of Crash of the Titans and Crash: Mind over Mutant where Crash would sometimes do the dance when standing still for a while. Coco would also sometimes imitate the dance as an idle animation in the latter.

In the intro to the Japanese version of Crash Bandicoot: Warped, Crash does an extended version of his usual dance, which is seen in various Japanese Crash ads.

In Crash Bandicoot 3: Warped, getting 100% complete will include an Easter egg in a few stages where Fake Crash could be seen dancing (obviously referencing the Crash Dance).

Manga
A small section of the Crash Dance can be seen in Dansu! De Jump! Na Daibouken!. The section shown is when Crash puts out his fists and brings then back in. Crash does the small section of the dance when Crash and Aku Aku get their first "Power Stone". Also, at the end of Chapter 7 (Volume 1), it gives details on how to do the dance. The dance is a bit modified though. On step 2, it shows Crash snapping his fingers and step 3, it shows Crash's palms facing sideways.

Trivia

 * The dance is widely known by fans. Surprisingly enough, the dance was actually created by the Japanese according to Crash's creators in an interview.
 * The dance was introduced in a Japanese commercial to the first Crash Bandicoot game. The game itself did not have this iconic dance.