[footfootfoot]

Let's see. Most calories per gram? Fat @ 9/gm
10,000cal/9cal/gm=1111.11gm
1111.11gms/28.35gm/oz=39.2oz pure fat/10,000 cal

heavy cream (94%cal from fat) = 1 cup fluid = 821cal x 12 cups =10000cal

Let's suppose that some sick bastard thinks an ice cream sundae made of lard is a real thing. You'd need a bit more than a two pound lard sundae to = 10000cal

Let's suppose some slightly less sick bastard thinks that heavy whipping cream alone would make a better sundae. You'd need 12 cups or 3/4 gallon of whipping cream to = 10000 cal

Let's say you were not insane and you made some really rich, premium ice cream, that would average about 66cal/oz. You'd need 151 ounces of ice cream or eleven pints to hit 10,000 cal.

Even cool hand Luke couldn't eat that much lard, cream, or ice cream.