<i>(Singing, to tune of Foxy Lady over Bus microphone)</i> Do do...
Otto: (Singing, to tune of "Foxy Lady" over Bus microphone) Do do doo, do doo do doo, do do do doo.
Bart: Hey Otto, can I use that microphone.
Otto: ..doo do do (Switches off) Sorry Bart dude, it's for emergencies only. (Switches back on) Doo doo doo.