*in class, last year of masters program in cs*
Lecturer is talking about how digital signatures are used to verify software
Some Guy: I don't get it, what are signatures? How do they work?
*first facepalm*
Lecturer proceeds to explain signing using RSA quickly.
Some other guy next to me: Wow that's cool! Had no idea that this is how it works!
My brain: We've needed this knowledge since year 2, HOW ARE YOU HERE???