At a former job, a male coworker would spend time in every conversation we had just staring at my boobs. He'd either talk to them for a while (instead of making eye contact) or take a space break at the end and mutely look. Just like Bridget Jones' older boss did in the first movie, but for a longer time.
I think it takes me by surprise so much because I used to be thinner and pretty much had no boobs to stare at, so I was used not getting attention for them. Now that I'm plus size, it'll happen every so often and in that way.