When you spend a half hour going through all of Brandon's books on Goodreads and adding them as to-reads or giving them ratings and consider it a wonderful use of your time.
In addition, when every video game animal you catch/tame/unlock is named after the cosmere in some way, sometimes without realizing it. (For example, naming one of your horses in Breath of the Wild "Amara" and realizing weeks later you accidently named a line of code after Amaram and mentally smack yourself.)