I was watching my high school basketball team play a close game that we had been losing narrowly for much of it. A few seconds before the end, with my school's team down by 2, a player made a 3-point basket to give the team a 1-point lead. Time to celebrate...
except it wasn't, because one of the players on the opposing sports team took the ball all the way down the court in the last 5 seconds and made a basket, literally right as the buzzer sounded. It was hard to even tell if the shot was made before the buzzer or not, and more complicated by the refs adding 3 seconds near the end for unclear reasons. Luckily, we got the last laugh by beating the same team in the playoffs a few weeks later.