Magical hijinkx. Like pulling a Houdini, but funnier.
i.e. Like David Blane freaking out strangers in the street. Or the crazy sh!t you might have got into last night but can't fully explain.
in a sentence: David Blane pulled some major majinka on some drunk folks at a bar.
or: We pulled a majinka when we woke up with no memory of how the car ended up in the swimming pool.