I have never had that problem with my size 10.5 cowboy boots on (which I wear about 350 days a year...)

I did however have it happen once when I was wearing those large rubber soled sneaker style hiking boots...

...and it just so happened to be the first time I started the VX up after installing the Interceptor. It freaked me out big time.

(No VX's, people, animals, plants or other inanimate objects were harmed during this incident.)