Well, if you're trying to find a reason, it should make sense for your 'verse.
"Jack, you have debauched my sloth."
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They accidentally cooked a toaster oven in a regular oven. This created a situation that the laws of physics could not reconcile, so for some reason it generated an interdimensional portal that sucked them in.
Alternatively, the Universal Union could have invaded and sent them to the alternate world, or a Resonance Cascade could have occurred.
"Sarchasm: The gulf between the author of sarcastic wit and the person that doesn't get it."
A mission from God/aliens/some other eldritch being.
Fantasy: Standing stones at night, a fairy ring, going down a rabbit hole of some kind.
Science: Parent(s) are scientists, bring kids to the lab, kids get into something.
Without knowing what kind of story you want to write, it's hard to suggest anything definite.
Or for now, if you don't know exactly what kind of a story you want to write yet, work that out first then find an actual reason later.
"Jack, you have debauched my sloth."
Well the two boys get sent into an alternate steampunk world where gender roles are reversed. The universe they're in has two forces of magic. One is hemomancy (blood magic) which means the user would have to be a murderer. The second is Naturamancy which is nature based magic.
What do you want the characters to be doing?
You could have their parent(s) sucked into the world by mistake, and them going after.
Actually it's important that the parents aren't there because they end up getting mistaken for other people.
My current idea is that they go to some fair or festival and run into a hemo/naturamancy user with a grudge against men.
edited 11th May '11 11:09:34 AM by JewelyJ
Oh, part of the root of that story is that the kids spend a long time looking for their parents, so they shouldn't be there in that sense.
And well, getting put into another world was part of the whole D&D cartoon story.
edited 11th May '11 12:13:27 PM by blueharp
for two boys being sent to an alternate world.
Something that won't break Willing Suspension of Disbelief. I'm thinking some kind of dark magic or witchcraft. I would use something scientific but I don't know enough about science to explain something like this.
Any ideas?