Many months ago I started seeing the number 11 everywhere.  It would pop up all over the place for days on end.  Every time I looked at a clock it would be at 11 minutes past the hour; the convenience store bill would come to $11.11; numbers and addresses all through the day at work would have an inordinate amount of 11's.  It would stop for a day or two and the numbers in my life would go back to appearing at random.  But then it would come back with a vengeance and there would be day after day with the number 11 suddenly everywhere I turned.
Googling it turned up quite a few results of varying believability.  Part of me knew that it may have been just a coincidence (once I noticed the first few 11's my mind started looking for them subconsciously and I just thought they were everywhere).  But at the same time another part of me thought it was a sign the universe was sending out and I should listen.  I decided to take a mid-range approach and use a mix of both to be what I would go with: if it's a sign then that's cool, they'll eventually point me in some direction and let me know what it's a sign of...but if some big sign doesn't happen then it was just in my head and I didn't need to think about it anymore.  Naturally the 11s disappeared.  I didn't notice when they stopped, they just went away like it had never happened.  It was either all a coincidence or I pissed off whoever was sending me the signs by being so apathetic about it and they stopped sending them to me.  
Whatever the case, I hadn't thought anything about it again since early summer.  Until Friday night.  I realized that Sunday (today) was the eleventh day of November, 11/11, and everything came crashing back into my head with an odd sense of urgency this time.  I even had some run ins with 11s earlier in the week but I hadn't noticed them until Friday night.  I don't know if there was something profound or life-altering I was supposed to do or learn today.  I've decided not to let it go this time though.  I'm going to treat it as a positive sign and see what happens.