Panic/Euphoria Model (most euphoric in history): Someone shared this in January and Citi just doubled down again on their call, 

• "Sentiment readings in late January 2020 had suggested caution and then dropped into panic territory in the second half of March 2020 given a 35% share price selloff," Citi's Tobias Levkovich and team write in a note. "Due to the rebound rally, our primary gauge bounced back into Euphoria territory, and current readings are implying a 100% chance of market downside risk, based  on history, though relentless central bank liquidity is backstopping ebullient portfolio positioning."

Google this for the full article:

Citi's sentiment gauge signaling a 100% chance of 'losing money': At the Open