Warren Buffett blasted Bitcoin as a worthless delusion and 'rat poison squared.'

• Warren Buffett has repeatedly criticized Bitcoin and other cryptocurrencies as risky and worthless.
• "I can say almost with certainty that they will come to a bad ending," the billionaire investor and Berkshire Hathaway CEO said.
• Bitcoin has skyrocketed as much as 350% in the past year to record highs.
• Here are Buffett's 16 best quotes about crypto.