Giants are unable to lie
Just a funny story about how giants in my game became unable to lie.
It all started when my party entered a castle built in giant proportions. They did some exploring and learned the castle was home to a giant, so naturally they wanted to do some nature checks to see what they knew about giants before they went in to negotiate.
They rolled pretty high, so I asked them what they wanted to know about giants. They asked what giants were into, what they liked and disliked. In my head I said "giants are big so they like big things". But what came out of my millennial mouth was "they like big butts, and they cannot lie". So there's two facts about giants I guess.
What sealed the deal was the players' reaction. The tiefling fighter immediately stood up and started doing lunges and squats to get that post workout booty pump. When I say she stood up and did this, I mean the player stood up and did lunges and squats in the middle of the living room. I had to give her advantage on the performance check plus inspiration of course.
Needless to say, the giant was impressed with the buns on the fighter and spoke only the truth during the negotiation.