The teacher is doing math with her class.

She asks, “Timmy, if I have five cats and give you two, how many cats do you have?”
Timmy says, “Three.”
Teacher, “No, it’s two. Now, if I have THREE cats and I give you ONE more, how many cats do you have?”
Timmy says, “Four.”
Teacher says, “No, I only gave you three cats total.”
Timmy, “Yeah, but I already have a damn cat.”