Magic banana

Two Polish guys were taking their first train 🚂 trip to Warsaw on the train. A vendor came down the corridor selling bananas which they'd never seen before. Each bought one.

The first one eagerly peeled the banana 🍌 and bit into it just as the train went into a tunnel. When the train 🚂 emerged from the tunnel, he looked across to his friend and said, "I wouldn't eat that if I were you."

"Why not?"

"I took one bite and went blind for half a minute."😵🙏