I'm watching 50's alien invasion film This Island Earth. Three nuclear physicists walk into a laboratory and hear a cat mewling. The pretty one says:

"Its only Neutron! We call him that because he's so positive!"

Further, nobody seems to notice the aliens have really huge foreheads.

Important Update: No, wait! By looking at charcoal sketches of their alien hosts, the three nuclear physicists have now discovered that they have abnormally high forheads! Its not clear where these sketches came from, nor why they didn't notice the high foreheads during dinner just minutes before, but, well, this is an exciting development! Perhaps earth really will survive! I can only hope...

Up-update: Due to the overwhelming response (one comment) from this site's vast following (probably also one reader) I have culled through said voluminous discussion to summarize the best of those comments right here: You can learn more about bad movie physics at Intuiter Insultingly Bad Movie Physics. As the site puts its: "The minds of our children and their ability to master vectors are (shudder) at stake." (Thanks, Harry)