Task two, quite a challenge with only a limited amount of time under the water.

The third. I loved when Krum was under the Imperius curse. He used Crucio. It made you think he was bad.

I'm a little torn between the first and second task, but I'll go with #2.

I live right next to a massive lake, and I think of the second task whenever I go down on the beach or docks. And I like the idea of mer-people in general.

i would have to say the first one because i like dragons and what not and it was interesting but so was the third one.

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"You said to us once before," said Hermione quietly, "that there was time to turn back if we wanted to. We've had time, haven't we?"

1st task, I imagine would be much more entertaining to watch and exciting to play. Less suspenseful and less likely to give nightmares.