Never. And yesterday they got me.
No, not a crash and burn. Been there. Yesterday I was going through a busy intersection. Next thing I see is mr. biker cop with blue and red right on my tail. That's the first time they saw me before I saw them. I pull over hand him my license and wait about 5 minutes. He comes back gives me a ticket and says, "please wear your belt." Because you care? Yeah right. He also said I could apply for seat belt school/re-education class aka blood and guts 101. Been there.
Like J-man, I grew up never wearing a seat belt. As a young child, I often sat in the front seat of our crappy gremlin. As tempted as I am to go on a diatribe about this whole issue, I can't at the moment due to time constraints.
The seat belt harrassment/law is one of the few things I am passionate about. You can even find a thread from me the Auto forum. If you live in Nevada, I suggest you read it.