Calling out that the group was now on "Carpool Karaoke," Grohl exclaimed, "Full circle!"
In fact, Grohl was full of one-liners while singing his hits. "I've never done that in a car before," he quipped following a spirited air drum performance of "Best of You."
After crooning "The Sky Is a Neighborhood," Mendel announced, "There's a lot of words in that song!"
Grohl responded, "I worked really hard on that song, you guys!"