Joke:
Teo visits the doctor and says, "Doc, every time I drink coffee, my eyes keep twitching!"
The doctor asks, "What kind of coffee do you drink?"
Teo: "Instant coffee, fancy stuff, bought at the supermarket!"
The doctor nods: "Got it! Next time, take the spoon out of the cup before drinking, so it doesn’t poke your eyes!"  
Explanation:
The humor comes from a silly misunderstanding. Teo complains about his eyes twitching (maybe involuntary blinking or discomfort) after drinking coffee. The doctor jokingly pretends Teo’s issue is caused by leaving a spoon in the cup, so when he drinks, the spoon hits his eyes, making them twitch. The absurdity of someone drinking with a spoon still in the cup creates the laugh.