The 3rd base coach isn’t the only one who flashes signs.
I ordered a salad which meant the waiter had to up-sell me to top it with chicken or steak. As he asked – would you like steak tips with that– he shook his head no. Jamaican jerk chicken? Grilled shrimp? Before I could answer he shook his head no each time.
Be aware of subtle body language signs you might be issuing even as your words indicate something different.