This was a gag in a stripcreator cartoon a long time ago...
When Lisa woke up, Ethan wasn't in bed. She walked to the den and saw Ethan playing his new game. "Morning," she said. "When did you wake up?" "Never slept," said Ethan, watching the two titanic figures on the monitor beat each other senseless. "You've been playing that since last night?" asked Lisa. "Yup," said Ethan. "It's a really tough game. I get really, really close, but in the end just can't beat it." "What's it called?" asked Lisa. "Immortal Kombat 2," said Ethan. Lisa thought for a moment. "How did you solve the first Immortal Kombat?" Ethan didn't answer.