Based on the search results, there were several events that happened on the 18th hole at the Ryder Cup. Here are some of them:

• On Friday, the Ryder Cup was getting tight when three improbable putts fell, sending the scene into chaos.
• On Saturday, Rory McIlroy and Matt Fitzpatrick lost their Ryder Cup match to Patrick Cantlay and Wyndham Clark on the 18th hole. NBC footage showed McIlroy screaming at someone, while caddie Jim "Bones" Mackay was standing close by. McIlroy shouted: "This cant happen. This cant happen. Its a f---ing disgrace." Mackay is American player Justin Thomas caddie.
• After the match, McIlroy was involved in a car park altercation with a Team USA caddie as tensions boiled over after a dramatic finish to the Saturday.
• New footage has emerged of Rory McIlroys argument with Patrick Cantlays caddie on the 18th green as Joe LaCava appeared to anger.
• On Saturday afternoon, Cantlay made birdies on three consecutive holes to help defeat McIlroy and Fitzpatrick, including a 43-footer on the 18th hole to win the match. After Cantlay made the final putt, he pretended to tip a hat to the crowd. Other American players, caddies, and team members waved their hats to European fans as well.

It is unclear which specific event the question is referring to, but based on the search results, there were several notable events that happened on the 18th hole at the Ryder Cup.