1. Sheriff of Nottingham in Robin Hood: The Prince of Thieves - he was evil but funny at the same time. One can't help but to laugh at his frustrations because of what Robin Hood did to him.
2. Hans Gruber in Die Hard - some say this was the best villain ever. He was so good in this movie. Cold, calculative, clever. And of course the classic final scene where he fell to his death - how his look of wickedness changed to one of surprise and then of terror as he fell, all in slo-mo!
3. Alexander Dane in Galaxy Quest - he brought so much humour in this spoof of Star Trek. REally loved what he brought into this movie. And he managed to bring such a tear-jerking moment in a comedy movie (see the clip from 1:20 onwards).
4. Harry in Love Actually - back to a serious role, not really a villain but a not so good person. This role showed his emotional range. The clips below are the classic scenes - the first, the hilarious scene with Rowan Atkinson, and the second, the very moving scene - "A classic fool".
5. Severus Snape in the Harry Potter series - and of course, Snape. Most people of this generation will remember him for this role. I must say that Snape is probably the most interesting character in the HP series and Alan really played it well!