The manager of The Big Short rang the alarm on the greatest speculative bubble of all time last summer. He warned the retail investors piling into meme stocks and cryptocurrencies that they were careening towards the "mother of all crashes". The S&P 500 has fallen 15% and the Nasdaq has fallen 24% this year. He took credit for calling the sell-off, explained why he expects further declines, and cautioned against buying into relief rallies. The S&P 500 index rose from a low of 2,192 points in the spring of 2020 to 4,089 points on Tuesday. In the next few years, it could plummet by over 50%, according to Burry. The S&P 500 has traded lower after crashes in the past. He pointed out that the index bottomed out in 2009, it was lower in 2002, and it was lower in 1975 than it was in 1998. The benchmark index could trade 15% lower in the spring of 2020 if it follows that historical pattern. Keep reading.Here's a roundup of Burry's latest tweets about the stock-market slump: