Always keep cables (the two prongerZ) from dead radios, laptop/notebook chargers, electric razors, etc.
I have power cables 10 years old from my power cable bin in the garage filled with these. Apparently none of you were ever without (or grew up in the 80's) because you would save all of them, they are like gold in the IT world (Information Technology... well maybe not "GOLD" to the new IT guys, just the old schoolerz, yet I'm [only] 34).
You can
buy longer cords anywhere internet based if you are weary of the Christmas-Tree-type fire-hazard issue.
A search on ebay.com:
2 prong laptop
Hit Buy it now, then Sort by lowest price 1st and you got 1 for 3 bucks! Well right now...