You've got to love the nerd character. So completely ridiculous and non-threatening. No matter how awkward you feel in your own life, you always know you're at least cooler than Urkel.
And if you had an Urkel in your life, no matter who intimidates you or pushes you around, you could always count one being able to stuff him into a locker...
... And that's actor Jaleel White today. I was going to make some joke about how Urkel could beat us all up now -- but but he was recently arrested for domestic battery, so suddenly that doesn't seem funny any more.
Ah, but kid actors often go off the rails a little bit when they get older. No need to dwell on that.