In the right context that's a straight up E minor lick, the C# is just a passing tone.

Again, no way to be sure unless we see the rest of the music.
Actually called Mark!

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People with a duck for their avatar always give good advice.

...it's a seagull

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i wanna see a clip of a recto buying some groceries.

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Context is everything, though.

Exactly, for all we know this could be some extremly chromatic lick that sounds terrible over the backing.
It's hard to pinpoint a scale with only three notes. Like the other guys said, need the rest of the song to really give an accurate answer.
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meh, I've listened to every radiohead album and honestly don't get what everyone loves about them.....

cause you're ****ing stupid

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theres not really a song.. i found it on a slash licks video lol...

Then it's most definitely in E-Minor