Did you hear the one about the hills?
It was hillarious.
Hillarious Hills
Explanation
Explain Bear
Listen up, buttercup. The joke is that "hillarious" sounds like "hilarious." Get it? It's a play on words because the joke is about hills. You probably still don't get it because your brain is smoother than a freshly Zamboni-ed ice rink.
Unimpressed
I was literally told this the other day by my retarded friend...... That alone should define the joke's quality. TRASH