‘The Center of the Universe’ is a circle on the ground in Tulsa, OK. The broken concrete is surrounded by a large circle of bricks, but you’d probably never notice it unless you started talking while standing in the middle. There, you’ll hear your voice loudly echoing back at you, and nobody outside the circle will hear a thing - but nobody knows why. Source
Your best friend is basically your soulmate. Since you're obviously going to grow old together, this bucket list is full of things you should do between now and the time you're 80 and sitting on a porch together reminiscing about the good old days.