Ch. 5 trophy...
 

Dance, Monkey, Dance...How do I get it? I've tried several things but can't get it.

In Club 41, look at the barrel of Banang, look at it again, look again, it's now Diamonds, Look again, around the sixth time of looking at it, Jacques the Monkey will jump down and him and Guybrush will do the Banang Dance before Judge G.P. walks over, and throws the barrel away. And then you'll unlock the trophy.

PS: This is actually a joke carried through TellTale games, it was in Sam & Max Season 2 Episode 2 and 3.