When they went to record the song, Tony wasn't ready. He said "Don't Start!.....ah, too late." They didn't have a song title at the time so they decided to call the song "Don't Start (Too Late)." I always thought that was kind of interesting.
I know it's not a pen, but personally I love my Magic Flight Launch Box. I've been using mine almost daily for the past year and I love it. It's small, easy to use, very stealthy, doesn't smell, and works great!