Well first in the theme song at the end if play it reversed
u can hear a small voice that says "three letters back" and if u play it fowards u can hear it says "switch a to z"
Another mystery is that at the end of the theme song it has a picture thats on the bottom it has a scrambled message like it says in the theme song u have to move 3 letters back to crack the code and when ur done it says "stab is not what he seems"
Another mystery is that at the end of each episode in the credits it show a scrambled message like the one to the right to decode it u have to us the term three letters back in the first episode it said welcome to gravity falls well thats all for now if u want to u could leave questions or comments
Reason. 1. is. they. won't. find. love
Reason. 2. is. They always. Love ❤ each other
Reason 3 is. they always. do. things. Together
Reasons. way dipper. won't. find. Love
Reason. 1. he. is. a. nerd
Reason. 2 he
read's. Boring books
Reason. 3. he. is. awkward
Reasons way. Mabel. won't. Find. Love
Reason 1. she. is. crazy
Reason 2. she. is. in. stupid idiot.
Reason 3. is. boys. Just don't like. Her
Reasons. Way. dipper and. Mabel. will. always. Love ❤. each other
Reason. 1. is. they. always. protect each other
Reason 2. is. they. love. to. go on adventures. Together
Reason. 3. is. they. Love to. love. each other