Bobby Brown and Dinah Moe Hum by Frank Zappa
Thriller
ABC - ABC It’s easy as 1 2 3
It reads like an instruction book when you view the lyrics now.
The “Benny Hill” theme. Wanna see the kiddies running after the truck which is going in figure 8s and circles on peoples’ lawns…
Or “Chariots of Fire” theme.
Hell Is for Children – Pat Benatar
The Father Who Must Be Killed – Morrissey
“Candy shop” - 50 Cent
The soundtrack to any porno, although it would be hilarious for the 6-year olds to not get it, and then watch the awkward 12-year-olds figure it out.
That’s all I’ve got.
Once I actually heard an ice cream truck playing a tinkly version of the theme song from MASH (“Suicide is Painless”). I have also heard this song (in a bland, easy-listening orchestral version) on the canned-music channel that they pipe into hospital rooms. The association with the television version of MASH would, in itself, make the song an odd choice for these uses, but the memory of the downbeat and depressing lyrics (as heard in the film version of MAS*H) make it even worse.
I would SO use this if I had an ice cream truck!!
I want to get an ice cream truck with hydraulics and just play Dr Dre’s The Chronic over and over, while I ride around the neighborhood on three wheels.
I might also consider
Poisoning Pigeons in the Park
Summer in the City - Lovin’ Spoonful
Barber’s Adagio for Strings
“SheBop”-Cyndi Lauper
“Like a Virgin” and “Justify My Love”-Madonna
“I Touch Myself”-the Divinyls
“You’re Standing On My Neck”-Splendora (the theme song from Daria)
There’s a local ice cream truck (at least, that’s what I assume it is) that is spraypainted completely red and drives around the neighborhood about once a month playing the theme music from The Godfather. Weird.
We had an ice cream truck last season that played La Cucaracha in a slow and solemn measure. It sounded wrong! How about Magical Trevor, or Cows With Guns? 
Damn! Just half an hour ago the ice cream truck came by playing La Cucaracha! It’s so wrong for at least two different reasons.
The Funeral March
Taps
appropriate for the “Goth” ice cream truck 
A friend of mine has THE CREEPIEST ice cream truck in the world in his neighborhood. It drives around at about 6:00pm all year long (so in the winter it is dark already) and it has a single chime that echos. It sounds like sonar.
I tell you, the first time I saw this thing drive by I got the willies something awful. You just are just certain that the driver *knows * the difference between a thousand dead babies and a Ferrari.
Hint: I am fairly sure he doesn’t have a Ferrari in his garage
Damn straight.
Rain on the scarecrow! Blood on the plow!
2 Hyped Brothers and a Dog’s “Doo-Doo Brown.”
Inappropriate, but nonetheless kinda kewl.
Children Of The Grave by Black Sabbath.
As long as there weren’t gun toting vigilantes looking for me, I wouldn’t care what the ice cream truck played…
Oh OK!
“Touch-a Touch-a Touch Me” from the Rocky Horror soundtrack…