For the record, yes, a couple of times we have gone-around as a result of people going walkabout in the cabin, both drunks. Both were refused onward/return travel with us and had to buy new tickets elsewhere.
gimpie - I notice you're from the USA where (in my personal experience) there is a very different philosophy on the use of the seatbelt signs. American carriers sem to put the signs on all the way from take-off to top of climb, and all the way down again from top of drop. the slightest wiff of turbulence seems to generate a prolonged period of being strapped in. I have always assumed that this was driven by the threat of litigation, but stand to be corrected. The extended time that the signs are on has (in my view) tended to promote a disrespect for it. European airlines tend (a generalisation I know) to put the signs on for shorter periods, less often, but then to mean and enforce it. No doubt there will be other opinions on this.