"Steve Urkel" (played by actor Jaleel White) was a nerdish character on the sitcom Family Matters. His popularity with the fans won him the number-one spot as America's favorite nerd. If he caused an accident he would say "Did I do that?" The character was so popular that it was brought from recurring into regular appearance. A song and dance was created based on the character that was fairly popular among teenagers for a brief time.
As the series progressed and White outgrew his own child-like voice his performance became more affected and strained. A female "cousin" character (Myrtle Urkel) was created, also played by White; and eventually a suave, sexy alter-ego, also named Steve Urkel (but with the last name proncounced "Ur-KEL" instead of being a spondee).