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.”