From wikipedia: “A lolcat is an image macro featuring a photograph of a cat with a humorous and idiosyncratic caption”.
You can find good lolcats all over the web, and I just found out that you don’t even have to have photoshop to do this. Make your own lolcat with the lolcat builder. Go with Impact and outline, this will give the best “real lolcat” feeling.
Have fun!