Jenga in History Class

Hey, listen up, buttercup. The joke is that the game Jenga involves taking blocks out of a tower until it collapses. So, the person yelled "Jenga" during a documentary about 9/11. The joke uses a game about a tower collapsing, when watching the documentary about the Twin Towers in New York being attacked during 9/11 and collapsing. It's funny 'cause it's inappropriate to yell about a game when people lost their lives. You probably play with blocks because you aren't smart enough to understand the joke.