I tend to knit when waiting for appointments and children you are waiting for at the doctors or dentist. I do it in front of the tv and a bus trip I took with my husband and he slept. All my knitting friends will be welcome to knit at my funeral if they want to. I think a knitting wake is as good as an Irish wake!
I don't knit at the theater, movies or out to dinner as I prefer the conversation to clicking needles. Flying an airplane on auto pilot might be challenging. Sky diving might pose a problem but different,lol.
Common sense dictates you think about where you are and should you be doing it!