I guess I should answer my own questions...

Funniest - on first viewing, 'A Fish Called Wanda' but for repeated viewings I'll go for 'Clerks' (and it is my fave movie)

Scariest - another vote for 'Alien' although 'Jaws' gave me the willies.

Saddest - hmmm, when I was a kid 'Charlotte's Web'. As an adult, and I'm still trying to pin down why, 'Gattaca' always puts a lump in my throat when Jude Law kills himself near the end.

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It is so hard to look cool walking down a hill!