Best Songs To Sing In The Car To Embarrass Your Kids

Ok, I'll start.

I fought the law by Bobby Fuller

Barbara Anne by the Beach Boys (Help me Rhonda is a close second)

Jambalaya by Hank Williams

Do this in the pickup line and they'll turn beet-red.
Zappa's "The torture never stops" will blow their minds and they will never stop thanking you.  Or perhaps Roger Water's tune off of Umma Gumma, "Several species of small fury animals gathered together in a cave and grooving with a pict."  Getting the so called words down might take a while though.  If you play that for them on a dark night they will never stop cursing you.