Why do they tell you to tie your lifevest on the left side during safety briefings?
After many questions to the various crew members/ground crew on the next few flights I did, I have managed to get an answer that makes sense.

You are told to tie the life vest on the left side for two reasons:


The inflate toggle hangs on the right side of the lifevest and if you were trying to tie the knot below it then you might pull it by accident, inflating the lifevest inside the plane.
If you tie the knot with a bow, instead of the double knot, then if the bow was on the right side there is a chance that you will get it tangled in the pull toggle while moving around the plane, inflating it before you exit.