It's like a kid learning how to ride a bike for the first time.
It's liked a professional sports team winning the championship for the first time.
It's like making the high school football team for the first time.
It's like a kid on Christmas morning looking at presents under the tree.
It's like a dog getting a brand new bone from the pet shop.
It's like a student on his/her last day of school.
It's like graduating from collage after the sixteen hard years.
It's like an employee getting that raise he/she has wanted for so long.
It's like seeing the very first snowfall.
It's like an actor/actress winning the very first Grammy.
It's like going on the vacation of your dreams.
It's like getting rid of that cancer that almost took your life.
It's just the priceless looks like these that make these things memorable.