Hoodini
“What do you call a magic owl? Hoodini!”
"Hoodini" became a stock reply dropped into YouTube comments under almost any video, the same way people used to answer everything with "Darude - Sandstorm".
Where it's from: A joke told by a player in an owl mask at a GTA Online comedy club in VanossGaming's "GTA 5 Online Funny Moments" video (June 22, 2015).
Sources: knowyourmeme.com
