I answer incoming calls as part of my job. The spiel I have to give isn't that long, just "Good morning/afternoon, Company name, this is Mischief, how can I help you?"
Sometimes someone won't even let me get that much out before they start to request the person they called for. Which makes me have to ask them to repeat themselves, as they were speaking at the same time as me and I couldn't tell what they said.
The caller who did this to me today, even interrupted me AGAIN the second time I got on the line with them to say the person they wanted wasn't available, and would they like his voice mail. They are speaking over me and trying to tell me a message to give the person. No thanks...just leave it in his voice mail, please.
In such a huge rush, the caller ends up wasting more time having to repeat themselves, and makes me feel all of, oh, worthless because they aren't even paying attention to me at all.