Shouting in Powerpoint

I tried to improve on Guy Kawasaki’s 10-20-30 rule for presentations by making my font sizes even bigger than 30. Bigger size, less text, more impact and more chance of the point being remembered was my reasoning.

The problem is that if the font is too big, the audience can feel as if they are being shouted at.

So my learning is that it is alright to have titles in fonts slightly larger than 30 but do not have fonts that are too large (unless you are presenting to 80 year olds