"Thinking of U" was sung by The Beetles on Sesame Street. It was a love song all about about the letter "U". Near the end of the song, a giant "U" slowly descends from the ceiling and the band's drummer tells them "It's U, lads! Run, or we'll get crushed!" So they back up out of the way as the giant "U" descends fast, causing the front of the stage to shake on impact.