Gryffindor: Will confidently say the wrong answer.

Ravenclaw: Will come up with what they thought was an original idea or work, be really proud of it, only to realize that they accidently copied someone else.

Slytherin: Will hold a grudge for centuries before realizing it was a misunderstanding.

Hufflepuff: Will give away something that they actually really wanted (like the last pizza or something) and hold a grudge against someone and behave passive aggressive towards them without realizing it.