If the "5th of May" is Inter’s worst nightmare, the equivalent for Juventus is the “Downpour in Perugia”, which took place on May 14, 2000

Today in Serie A – May 14, 2000: Calori’s Goal That Cost Juventus the Scudetto

If the "Cinque Maggio" is Inter’s worst Serie A nightmare, the equivalent for Juventus is the infamous Diluvio di Perugia (“Downpour in Perugia”), which took place on May 14, 2000. That was the day when the Bianconeri lost 0-1 to Perugia in the last matchday of the 1999/2000 campaign and saw Lazio pass them in the last lap to win their second Scudetto.
It was May 13, 2007, just a few days after the fifth anniversary of the "Cinque Maggio," when Inter beat Lazio 4-3

Today in Serie A – May 13, 2007: Inter Chased Away the Ghosts of the “Cinque Maggio”

The Cinque Maggio (“5th of May”) is undoubtedly Inter’s most painful memory in recent times. This infamous date refers to May 5, 2002, when the Nerazzurri threw away a Scudetto that looked already won by shockingly falling 2-4 in the final round of Serie A to a Lazio side that had nothing left to fight for. From then on, every time the Beneamata squared off against the Biancocelesti, the image of Ronaldo Luis Nazario da Lima crying on the bench while his shell-shocked teammates let Lazio run riot, came back to haunt the Inter fans’ nightmares.
When least expected, Inter turned into Napoli's best ally as they came from behind on Sunday to beat Lazio 3-1 at the San Siro

Inter vs Lazio 3-1: Nerazzurri Storm Back to Offer Napoli Golden Assist

When least expected, Inter turned into Napoli's best ally as they came from behind on Sunday to beat Lazio 3-1 at the San Siro. Despite an encouraging start, the Nerazzurri conceded one goal in the first half and that was all that Lazio needed to spoil the Partenopei's expected Scudetto party. But a brace from Lautaro Martinez and a single Robin Gosens goal put Simone Inzaghi's troops back on track.