Calvin and Hobbes by Bill Watterson for October 14, 1995
Hobbes: You're trading the Earth for 50 alien tree leaves?! Calvin: I'll have the coolest project in the class! And best of all, now we don't need to waste any more time on this! The aliens are doing all the work! We can goof off the rest of the day! Hobbes: But then the aliens take over the Earth. Calvin: Well it's not like the grownups have done such a bang-up job.