Supposing you ate 20 tubs of butter during one day. Would you die of a heart attack?

Hahaha. I'm sorry I had to laugh. It just sounded funny. The clogging of the arteries to the heart is a process that takes months and years, depositing the cholesterols there takes time. When you put a stress later in clogged arteries, like electricity there is better flow to open arteries and deprive the flow to the clogged ones. If you retch after the butter, that's the stress, the cause is way back.