Want to forget or ignore rigidity, aches and pains, etc... caused by PD ? like the old joke replace it with another malady, like an emergency trip to dr. after swallowing an extremely hot piece of potato.....betweeen the soreness, swallowing problems, etc. you 'll forget the p.d. or how about the sloppy accident of picking up the Ben Gay tube instead of the toothpaste.. (resulting in gum burns)........some of us are getting careless,,,,,,you know who you are,,,. ..back to rigidity >