So UNcle Joe got our MonkeyBear a guitar for Christmas. It plays the guitar parts to "Smoke on the Water" and "Bad to the Bone." It's an occasional toy. Skipy Jr will pick it up every couple weeks, play with it for a day or two, and then it goes back in the corner, but he still really likes it.
Of course those two songs over and over get annoying so sometimes we turn it off.
And then he started singing Duh Duh Duuuh Duh Duh Da Da. . . "Smoke on the Water" to himself. It makes him sounds like Beavis and Butthead (I looked on YouTube I can't find the video of them doing it).