Phineas and Ferb (2007)

S01E12 Jerk De Soleil

After their initial circus plans fall through, the boys decide to put on a neighborhood circus instead. Meanwhile, Jeremy mistakenly gives Candace some wild parsnips, triggering her allergy. On a separate note, Doofenshmirtz invents a gadget designed to raise people's voices, hoping it will make his voice sound lower in comparison.