pulled a ninja

When someone appears or disappears from the surrounding area with few or no people noticing.

Also when you do a really cool ninja move, especially if you could never do it again.

Joe: Oh, hi Jon.
Jon: Hi Joe.
Sam: Hey guys!
Joe: When did you get here?
Jon: He pulled a ninja.

Man: *drops glass*
Waiter: *catches glass without spilling drink*
Man: Wow, you just pulled a ninja!