I would be very careful w/ this one. I've had to explain to my parents that my girlfriend was pregnant (for real) and you never know what the response will be. Once you tell them that it's a joke, whether they're pretty liberal or not, there will be defiinite consequences.
Also, from the other side (as a parent), if my son ever tried this shit on me, there would be hell to pay. Luckily, I have a few years before he gets to that age
......With that said, I eagerly await video footage of this.