I have a two-hour round-trip commute to work every day. A while back I came up with a silly game to play while driving back and forth: I try to find some object I see from my car to match each letter of the alphabet. So, asphalt, curb, bicycle, ditch, and so on.
I can't find anything for X and Z, which isn't too surprising, but what really irks me is that I can't find anything for N, either. Why is N so difficult? It's a common letter!