Again, from "Split Personality" this has to be the single most "Did I just see that?" moment in Phineas and Ferb for me.
This gag came way out of nowhere, but I knew it right away. Plus, I just really like Phineas and Ferb's reaction.
Candace and Phineas Flynn and Ferb Fletcher, created by Dan Povenmire and Jeff Marsh, owned by Disney.