...when you have memorized every single line of all three films.
...when you act like Simba, think of Simba, dream about simba, talk like Simba, and basically
are Simba.
...when you have TLK merchandise in every visible corner of your house.
...when you begin to believe that The Lion King actually is for real and that if you wished hard enough, you could enter the TLK world and live there forever.
...when you join an online community forum like MLK.
Only the last one applies to me. xD