2004: We're going back to the Moon!
2015: No, fuck that, we're going to Mars!
2017: No, shit, the Moon we meant we're going to the Moon!
2018: Sorry, that was supposed to be Mars.
2019: Moon, we meant to say the Moon.
2020: MARS, GODDAMMIT!! ON A BILLION-PLUS-DOLLAR ROCKET THAT CAN'T LAUNCH MORE THAN ONCE A YEAR!!! HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!!!!!!!!!!!!!!!!!!!