Alien Theories xkcd.com/2953

It's ok aliens, I also have a hard time believing in myself

The aliens make a good argument.

they aren't wrong

Even the aliens want to believe.

They probably breathe fluoride too.

My favourite comic artist of this era

Title text: "They originally came here to try to investigate our chemtrail technology, and got increasingly frustrated when all their samples turned out to just be water ice with trace amounts of jet exhaust." Alt text: https://explainxkcd.com/2953#Transcript