Dexter Graham Bell is a Late Night with Conan O'Brien character who debuted on September 25th, 2001 in the sketch New Fall Characters. He is the perverted brother of Alexander Graham Bell.
Alexander: Come in here, Watson, I need you!
Dexter: [leans into the telephone] And I need you to look at my peeniiiiis! [as he's being beaten with a rolled up newspaper by Alexander] Look at it! I want you to touch it, Watson! Touch it, Watson!