There's a good excuse for this. I think.

[fuyu]

Me: Okay, it's late. I've got some homework to do for tomorrow, so I'd better--
Brain: Booooorriiiiiinnnng. Let's go play on StumbleUpon.
Me: Okay, but just for a little bit. Okay - no - no, I mean just for a little bit. That's enough.
Brain: You're so boring.
Me: Homework now.
Brain: But I'm so tired now... Do it tomorrow, we'll have time.
Me: If I am late turning in that silly assignment, so help me... Okay. Bed now, then, and homework as SOON as we get up.
Brain: Okee. OH HANG ON WAIT! FRACTALS!
Me: ... wtf but it's--
Brain: NONONONO FRACTALS. YOU WANTED TO TRY THAT AND WE DREW THAT SYMBOL FOR IT TODAY IN CLASS ANDANDANDAND FRACTAAAAALS.
Me: But I need to--
Brain: FRACTALS.
Me: ...

I have good intentions. It's my muse that's the troublemaker.