I always listen to other people. I don't necessarily put much stock in what they say without validation, but I always listen, even if it's something I don't want to hear. In fact, especially when it's something I don't want to hear.

Part of my internal checksum routine to stop me succumbing to confirmation bias. Most of the time it's fruitless of course, my filters are fairly well tuned, but now and again I get a surprise (not always pleasant either) but it all adds up to better filters in the long run, so worth it for me.