Deterioration of attention span due to questions that do not pertain to the lecture at hand.
When combined with woodhouse effect, the world ends.
Professor: "OK, so today we will cover Bernoulli Equation of Static Fluids...."
Daniel: "I have a question!!!"
(7 minutes later)
Daniel: "Of course!"
Class: (Bored as fuck) "I can feel the SZE effect growing"