Metering for exposure

I have done it again.........forgetting to switch my TTL metering on my SLR while taking photos, and I ended up with spot metering for each photo, making them overexposed in some. Thanks to Mr. Ho, I have learnt that uneven lighting creates overexposure in spot metering.

By the way, I've just got myself a polarising filter, so I'm definitely looking forward for more pretty skies and no more hazy skylines!