Histeria!

Teacher:
OK class, you have three apples and then you pick two more. What do ya have?

Charity Bazaar:
A bunch of stuff.

Teacher:
Uh, close enough. Ok, what do you have if I take away three?

Charity Bazaar:
Not so much stuff.

Teacher:
Uh, close enough.

Father Time:
In 1489, the plus and minus signs first came into use.

Charity Bazaar:
[holding up a paper graded with an F-] You know, I wish I could go back to the good old days.