I just say that
>it's hard for me to walk so I use a wheelchair (or crutches -- whatever I'm
>using at the moment). I never thought I was encouraging poor social skills
>by answering the question though.

Well we all know that that saying :" It takes a village to raise a child"
More than a few kids have parents that don't have manners themselves, or
think it's SOOOO CUTE to have their kid approach strangers and say things
off the top of their head...Not only do you have a chance to explain your
specific disability you have a chance to  teach a child tact and manners
since the parents won't ( I don't want my kids walking up to strangers
whether or not they have a disability).  This is a chance to let the kids
know that your legs, arms etc might not be working but that your heart and
brain are completely intact.  Not only do you  think as well as everyone
else you also have feelings like everyone else. Feelings that can be hurt by
rudeness ( which is different than curiosity).