Bicycle filled of you

For some reason, the song I find myself singing for Henry is "Bicycle Built for Two" (I sang "She'll Be Coming 'Round the Mountain" to Margaret at this age). Margaret knows the song from a ca;ssette her grandparents keep in the car. Only instead of singing "bicycle built for two" she sings "bicycle filled of you." Wes finds it gross, but I'm utterly charmed by it.