I have been talking alot with mu younger brother[the ones who's 13], and we talked about phones. Always when dads collegas are calling, they speak too fast that you wont know what they say, or what they to pretty OFTEN, is that they never say you name. He had a monolog about what would be fun to say to those who don't say what their name is.

"Hello, is you daddy home?"
"And who the hell am I talking to?!"
"Smith, is your daddy home?"
"WHO SMITH?!"

Something like that...

[Actualy he said Matti, since it is a common finnish name, but I changed it so you guys would understand...]