Just to be difficult (I'm a woman, it is my job) I don't have a foot switch.
I had an on/off type foot switch laying around and used it for a bit, but never got the hang of it, so haven't used it in years.
I keep putting off getting a deadman switch because I don't sit with my feet on the floor. I need to rig up a system like JT The Clock Man has, That way the switch could be useful.
At school, all of our Dewys have giant knee shut off switches installed. They are taking some getting used to, I keep hearing "Mrs.N, thats not how you are supposed to do it!" I am a creature of habit.