Most likely when you replaced the bulbs on the 5 year old string last year that you got from the other 10 year old string that you thought didn’t work anymore they gave you that last dying light that made your house look like crap because you put it in the middle of a huge strand of new sets. Then the night before it was going to die forever you put them away until this year when you found out that they were once again not working. Good luck finding the culpret bulb.
Oh, and by the way: There are new strands that use this crazy new awesome technology called LEDs (Light Emitting Diodes). They are brighter, more energy efficient, and best of all last wayyy longer than traditional holiday lighting.
Wait I know what you were going to ask next: “But what are the Cons?!”
There is only one con: they cost a little more. But hey thats not really a con when it saves money in the long run right? Check em out at your local wal-mart, home depot etc.