Jay Leno's evil twin goes on Late Night with David Letterman c. 1984 to rant about Star Trek and venereal disease. This is so far before my time I can't even begin to make sense of this clip. More on YouTube.

Survival tips for a parallel universe:

1) The Food Chain Rule. If it can eat you, you can eat it.

2) The Venom Rule. If a creature's venom is rapidly fatal, you can eat the creature.

3) The Bait and Spike Rule. Biological compatibility also increases the odds that some Earthly toxin, like bug spray or rat poison, will kill the alien creatures if you use it correctly.

4) The Dandelion Rule. Chances are, our ecology is as pernicious to theirs as theirs is to ours.

Click the link for full details...and be careful out there.