Years ago, when folk song parodies were getting airplay (Allan Sherman, "My Son the Folksinger" et el.) even imitators had imitators. One of the Allan Sherman derivatives, I forget who, did a song called "Marvin" to the tune of Funiculi, Funicula.

All I remember are the beginning, a bit of the chorus and the last line. Feel free to fill in the gaps.

Some think that raising kids is so bucolic
But that's a lie
But that's a lie.
With Marvin, I could become an alcoholic
And here is why
And here is why....

(chorus)
Marvin, Marvin, you're a rotten kid.
Why can't you be like your brother Sid?
da-dum, da-dum, da-dum, da-dum,
da-dum, da-dum, da-dum, da-dum
Stop chewing on your teddy bear
You're 28 years old.