Be literal and honest, but be vague.
For example:
An alien goes to earth where he poses as a newspaper writer to distract everyone from the fact that he wears tights.
Answer: Superman.
Now you try it but don't put the answer to see if we can guess the movie.
Man and woman share a ride across the country and become friends.
shareOk, trying this one again a little differently (Woman finds old flame who was believed to be dead. They go to the zoo together.)
Man in witness protection is found by ex fiance and they fall in love again as they are being chased across several states to end up at a zoo.