David Letterman had Paris Hilton take a smell test for her fragrances.

As if we didn't get enough analysis, Dr. Phil weighs in on Jason Collins coming out.

Gary Busey brought his bizarre brand of "Buseyism" to Jimmy Fallon.

Susan Sarandon's dogs were adorable and dominated Fallon's show.

David Letterman had swearing former anchor and Internet sensation A.J. Clemente on his show.

Ryan Lochte and David Letterman had an interesting conversation and other highlights from late night shows.

Hear Yeah Yeah Yeahs perform "Sacrilege" on "Letterman," with a full choir.

See Wavves' network debut, playing "Demon to Lean On" on "Letterman."

See Killer Mike and El-P perform "Untitled" on "Late Show with David Letterman."