Max was an old ice cream man and Homer Simpson was his best customer.
History
After Homer was fired from the Springfield Nuclear Power Plant for chasing after the van, he pays for an ice-cream bar (a Butter-Crusted ChocoRocket) with a hundred-dollar bill. Max suffers a fatal heart attack while trying to give Homer change.
At his funeral, Max's wife gave Homer her husband's ice cream truck and Homer became an ice cream man.
Appearances
Episode – "Ice Cream of Margie (with the Light Blue Hair)" 
Episode – "Flanders' Ladder" (ghost)