Newly Odd Words...

I get this odd thing with some words in occasions. No particular words just sometimes when I over examine them too much, they appear rather strange looking and I get the sensation of looking that them with the same eyes that look on a foreign language.

This happened last week whilst programming an Excel application which is a spreadsheet program. I suddenly got the above with the words 'sheets'. It just started to look odd and the more I looked at it, which I couldn't but help as it was in my code about 30 times, the more strange it looked.

Not strange enough that I don't recognize it but strange enough for me to just about question my spelling of it.