It can never be opposite day. When ever you say "HEY IT'S OPPOSITE DAY!" the opposite would apply therefor it would not be opposite day. Also if you say "IT'S NOT OPPOSITE DAY!" the affect is not applied.
For the blind, 🦇 it is light. 💡 For the hungry 😣 , it is bread. 🍞 For the sick, 💉 it is the cure. ⚕️ For the sad 😢 , it is joy. 😂 For the poor 🚫💰 , it is the treasure; 💰 ⛏️ for the debtor ➖ 💰 , it is forgiveness. 🙏 For the face 😶 , it is the lips 👄