Oh, you want context? Try reading this (including the comments).
I'm unsure of the timing here, whether Letterman or Burden did the joke first, or if it was just "in the air," a reaction to Jackson's odd enunciation on the lyric gone as viral as something could get in the pre-internet days.
So listen for yourself, and decide...is the chair his son?
Or, for contrast, see if the I-can't-believe-he-was-ever-this-young Steve Martin has a piece of furniture for an offspring...