Philosophy.
What the heck is it I hear you ask?
Well, here are some philosophical questions to get you on the right track...
Why is there something rather than nothing?
Is our universe real?
Does God really exist?
These questions will quickly dive into the deepest areas of your mind that you have never explored before, these questions could (and will) entertain you for minutes, hours, months or even years (hence why some have made a career out of it). Once you think you have an answer you look at another possible answer and realise that there just is no answer!
Admit it. Philosophy is cool, interesting and intriguing.
Before you go to bed tonight or wake up tomorrow just stop and think about one of the questions above.
Because at the end of the day, there MUST be an answer.