And my alarm clock. And the sound of a garage door opener....
The Northern Mockingbird may be the only bird that continues to learn new "songs" its entire life. As much as I enjoy them - they use those songs to demonstrate to a mate how viable they are. Scientists are unclear if having a large repertoire is important because it demonstrates that they're older and therefore more likely to produce good offspring and have good access to territory and food - or if having a good memory is selected itself (or something else entirely!). Anyway - they want to demonstrate how viable they are as mating material - so during the summer, some horny mockingbird will sit outside my window at 3am and sing every song it knows. Repeatedly. At the top of its wee little lungs. [sigh] And that, not too infrequently, includes the sound of my alarm clock. And any neighboring alarm clocks.
Add to the imitation of other birds the White-tailed Kite and the Red-shouldered Hawk. Some of these Mockingbirds are so good at it that I grab my camera and run out the door every freakin' time!