[quote=@Balance]
<Snipped quote by Darlit Glitch>

That's a [i]really[/i] clever answer. It's just that, well, turning off a light takes basically no energy. A little bit of telekinesis to flip the switch and bam. You're scaling up a very small phenomenon too much.
[/quote]

You have a point, but not everyone has or is able to gain telekinesis.
And I probably was but i wanted to provide a decent answer.
The likely hood of him having an experiment the next day isn't that big, and there are probably easier ways to turn it off, but this is a  what if situation, so providing the worst case scenario isn't outside the bounds.