Some Anvils Need to Be Dropped: Few would argue that there were some Anvilicious strips, but some of those strips were speaking out for very worthy causes, such as improvements in education and (most often) environmental consciousness...
With no air, the people started to die.
'Help us! Please stop!' was the public outcry.
A hatch opened up and the aliens said:
'We're sorry to hear that you soon will be dead:
But though you may find this slightly macabre,
We prefer your extinction to the loss of our job.''