Has Brian Regan really performed 27 times now on Late Show with David Letterman? Or is it 27 times overall, including NBC and CBS late-night spots? Either way, quite an accomplishment.

Just keeping count, or maintaining your spot in line, is something, too. As Regan reminds us in this set from Friday night’s show, in which he jokes about people who act as if their backpacks don’t take up all of our personal space, and entire families now trying to cut us in line. No cutting!

Roll the clip.