The What-If Machine.
The What-If Machine was an invention created by Professor Hubert J. Farnsworth. The device resembled a television set, and could predict the outcome of any "What if?" phrased question. The device's case was made of gold.
The machine was known to have answered a number of questions, such as "What if Bender became a human", "What if life was more like a video game", "What if Leela was more impulsive" and "What if Bender was really big", also Fry asked what if Bender was really big and Leela said "Bender already asked that" and he said " I know, I wanted to see it again and Farnsworth exclaimed " No were not seeing anything again". So Fry instead asked" what if he stayed in the 21st century.