When I send a package, send the bumper that's hanging off my car back to its rightful place on my car, and send a general message that I'm just trying to kill it at life, I also like to send the Bat-Signal. In glow-in-the-dark duct tape form. Because, really, I'm always experiencing at least a moderate level of distress. And I'm always interested in seeing who responds. One day it's going to be a girl who's an 8-5 on the Hot-Crazy Matrix. I know it.
Scotch glow-in-the-dark Batman duct tape tears easily, applies smoothly, and holds well even on curved surfaces, such as those Bat Roses some clever d-bag who isn't me made probably to great female fanfare and special favors. The tape is 1.88" wide and comes in 10-yard rolls.