[ozarker]

I have a coworker that does it constantly and it bugs me to no end. I have to respond, they then ask what they were going to ask seconds or minutes later. Effectively breaking my concentration twice and making things take longer than they should.

[Moru]

There is always at least one that haven't used chat. Most people are used to communicating in person and then it's rude to not start with "Hello". You directly get a feeling of the stress level of the other, if you should scram or if it's a good time for a question. It doesn't work in remote chat and it needs to be explained for them to understand the problem.

Personally I love the "Hi! Do you have a moment?". "Well, now I have...". Usually the following question will take the rest of my day at least. :-)