Students only hearing half of what a professor says isn’t always a problem. They may simply not understand an assignment and get a lower grade, but nobody dies. Still, there are those times where hearing every detail matters. Those are the times the professor rants on about a single concept for three or four weeks.
The color red as a symbol probably isn’t one of those life or death instances, but you certainly won’t sound as dumb if you hear it all.
RICK: So you're saying Jesus' words in red in the Bible represent lust?
BILLY: Well, he did hang around with hookers.
HOBO: They hear about half of what I say--if I'm lucky. I'm not sure why I try.
BEARD: Were you brave enough to ask which ones were the hookers? Cause I've got five bucks on their answer including a house elf.