Last night I tried the 'foolproof' RC's of looking at your nose with one eye closed, reading, blocking your nose and breathing.
All of them failed, except for the blocking of my nose. :?
This is obviously a testament to how everyone is different - but I would expect certain RC's to be more reliable than others.
And thats what this poll is about - what RC's are most effective and foolproof for you? Then we total it up and see what it says :D