"In fact!" — Burdensome Elf in "Phineas and Ferb Christmas Vacation!"
Burdensome elf is a very boring and chatty elf who appears in "Phineas and Ferb Christmas Vacation!". He told Blay'n (another elf) the story of Clewn't's life and that before, he was not so bitter, Blay'n but left because he was bored, then admits, "just get close and talk to the first person you see ... that's how you make friends, I will never attend a seminar," implying that either he was at or led a seminar on how to make friends. He makes a cameo during the big musical number in "Rollercoaster: The Musical!"