What would happen if I ingested 25 grams of pure cholesterol?

How can you get it?

Not a thing. Your body will just make that much less cholesterol that day and for a few days after that. Your numbers might even go down. Have you noticed that most people who go on a low fat low cholesterol diet only have a temporary drop in their numbers? So, eat as many eggs fried in butter as you want.
From Mary Enig
Cholesterol is not the cause of heart disease but rather a potent antioxidant weapon against free radicals in the blood, and a repair substance that helps heal arterial damage (although the arterial plaques themselves contain very little cholesterol.) However, like fats, cholesterol may be damaged by exposure to heat and oxygen. This damaged or oxidized cholesterol seems to promote both injury to the arterial cells as well as a pathological buildup of plaque in the arteries.50 Damaged cholesterol is found in powdered eggs, in powdered milk (added to reduced-fat milks to give them body) and in meats and fats that have been heated to high temperatures in frying and other high-temperature processes

I would laugh at you as you slowly choked on the horrible taste. It wouldn't do very much to your heart, if that's what your asking.

Don't know the gram to ounce conversion scale but that wouldn't be good for your body.

Your gallbladder would have it's work cut out for it.

Nothing. Eat a pound of bacon.

you would puke and get diarrhea good luck with that

Get some and let's try it!

You'd throw up. Try it and tell us.