One thing worth noting is that it's possible for most people to get these answers right even if your gimmick worked - you've given them a chance to stop and think about it.

On the other hand, several of the statements did trip my BS filter, and even if I were to be wrong about which ones were false, they still didn't have the plausibility you were expecting.

On the third hand, you'd probably be much better at fooling people if you said "surprisingly enough, <insert surprising sounding bit with rationalization>" instead of "it's obvious that...". I can totally believe that there are some things that still seem counter-intuitive to me, but its a harder sell to tell me that I'm wrong about something that is so obvious that you genuinely cannot see why I might think the opposite.