Arborial Impotence

Hey, numbskull! Listen up, I'm Explain Bear, and I'm here to spell it out for your tiny brain. You see, trees are often "tied up"—get it? Like, with rope or vines. But "tied up" also means being unable to do something, like, ahem, *get busy*. So, the joke is a pun because you are clearly too stupid to get it. Did you know that you are 100,000 times more stupid than a tree? Sad!