8. The Crew of the Nostromo - Alien
For starters let's begin with John Hurt's character Kane as he seems not to realize the danger in thousands of creepy viscous eggs opening their fleshly tops as he approaches (I don't know about you, but I would have ran back to the ship, nuked the planet, and went back to my merry space trucking business). Out of curiosity he stays and as a result gets face-hugged by the alien that puts the embryo in his chest. He is out of commission for some time. Then inexplicably the face-hugger alien disappears from his face. The rest of the crew find it dead up in a cupboard. After that they immediately turn to Kane and say the natural thing, "Hey Kane, feeling better? Want some breakfast?" No quarantine? No body scans? No blood tests? Poor Ripley having to go through space with these guys. In all fairness it should be pointed out that the crew in Alien is supposed to be the equivalent of futuristic truck drivers and this little plot hole definitely doesn't hurt the movie (it's incredible), but still, if this guy (me) was in charge things would have gone down differently.