Controversial is one. If that's not the word you're thinking of, looking up synonyms for contrary can help you find the one you want.
Contrary to popular belief...
yes they do contrary to popular belief
Contrary = "Contrary to popular belief ..."Country = "England is a country"
Contrary to popular belief, NO
Contrary to popular belief, teenagers can be very intelligent.
Contrary to popular belief, the poor may be happier than the rich.
Contrary to popular belief, not all IMAX theaters are domed.
yes they do contrary to popular belief
Her actions were contrary to her words, causing confusion among the team members.
As contrary to popular belief, all men can sit.
No, contrary to popular belief, he is in fact NOT a communist!
Usually at the beginning, for example: Contrary to popular belief, the word contrary is used at the beginning of the sentence in which it is used.