The line comes from Phineas and Ferb, the Disney Channel animated series that premiered in 2007 about stepbrothers Phineas Flynn and Ferb Fletcher and their pet platypus Perry, who secretly works as Agent P. In the show Phineas regularly notices Perry has slipped away and asks where he is, a small running joke that fans quickly recognised. The Dutch-dubbed version of that moment has since circulated on soundboards and in fan edits, where its familiar cartoon voice and simple question make it an easy shorthand for someone going missing.