Codenames

Two teams compete to find all their secret agents first. A spymaster gives one-word clues that point to multiple words on the board. The rest of the team tries to guess which words their spymaster meant. You have to be careful not to pick the other team's words or the assassin card that ends the game instantly. It leads to a lot of funny misunderstandings and clever associations. You can set it up in two minutes and people usually want to play several rounds in a row.