Would sending a baseball with a phrase written on it like "how about hearing my pitch" be a creative addition to an inquiry letter? Or would I stand out more as a novice?
After an informal poll, 100% of my development friends picked "novice." Sorry.
Only once in my life did I perform a stunt during a pitch. I was trying to get the assignment to write "How to Eat Fried Worms," so I brought in a container of worms and dumped them right out onto a plate. Considering the whole movie hinged on how disgusting it would be to eat worms, the visual reinforced the idea.
But truthfully, my pitch was pretty good, and I probably would have gotten the job without doing anything weird. On the whole, you’re much better off refining (and shortening) your pitch than figuring out the right prop to go with it.