In August 2011, Stewart poked fun at candidate Michelle Bachmann's frequent appearances on multiple news programs, joking, "She went on ESPN's Sunday Night Baseball, Real Housewives of New Jersey, and ended the night by attempting to bust Phineas and Ferb."
The "Perpetual Conflict-inator" joke returned in 2014, photoshopping an -inator behind Senator Mitch McConnell.
In the 2011 Extreme Makeover: Home Edition episode about the Rucker Family, Phineas and Ferb appear in a quick animated segment and give Ty Perrington a shrink ray to destroy the old house.
AOK has "Phineas and Ferb Start a Cult", where a now-25-year-old Phineas and Ferb start a cult in their backyard. Candace tries to report them to the IRS, and when that fails, she tries unsuccessfuly to show her mother. This plan is foiled thanks in part to Dr. Doofenshmirtz's salt-inator.