A friend of my son's was going to a comic convention where Nolan North was to appear. My son wanted to make a 3-D printed Ghost with a Deadpool styled face. The friend was to ask Nolan to sign it. What I made had an Adafruit Circuit Playground within it that I programmed with a light show and some small audio clips of Nolan's phrases.
It turned out very well and Nolan did sign it. It was, perhaps unsurprisingly, surprising that there were several "Ghost's" in attendance. None, of course, as well done as ours!