A man goes to his doctor and says, "Doc, I keep having these dreams. First I’m a teepee; then I’m a wigwam; then I’m a teepee; then I’m a wigwam. It’s driving me crazy. What’s wrong with me?" The doctor responds, "you need to relax. You’re two tents." Bonus: A physics professor and his assistant are working on liberating negatively-charged hydroxyl ions, when all of a sudden, the assistant says, "Wait, professor, what if the salicylic acids do not accept the hydroxyl ions?" And the professor responds, "That's no hydroxyl ion; that's my wife!"