THere are these weird yet pretty funny things called fainting goats
http://www.scienceforums.net/forums/showthread.php?t=17316&highlight=fainting+goats
and they might just hold the awnswer...
They apprently have developed a totally useless, and if they were wild, fairly fatal ability to fall over whenever something exciting happens. Perhaps this is evidence of to contradict that great anti-evolutionary angle of there never being anything in nature half completed. It could be just that intermediary step that nature takes before the next step that might make something useful and change the species for the better.
If your parents don't go with it, at least they'll have a good laugh.