Finding a solution to a problem that I've been hung up on, especially if it's one of those "well, can't search google for a solution to THIS". When the solution

Finding a solution to a problem that I've been hung up on, especially if it's one of those "well, can't search google for a solution to THIS". When the solution comes as a surprise. Spend three hours trying to figure something out, then go to the grocery store and have that "AHA! I got it" moment.