Lyre birds are incredible at mimicry. This one (in the video) even mimicked a Kookaburra perfectly.
I saw/heard one once that could imitate the sounds of different SLR cameras and mobile phone ringtones. Whenever it did a mobile phone ringtone people grabbed their phones thinking they were getting a call!
Sounded so real!
My dad still does something like this everytime he wants to go to a web page. I've tried many times to show him the correct way but he always ends up going back to his original way.