Many, many years ago when Dan Air got their super new 737-300's the fuel police decided that as they were Cat III they didn't need to carry any extra fuel as they would always get in! Memos regarding fuel carried were despatched and the crews departed Sunday evening to AMS, BRU and CDG.
Monday brought fog at LGW but being company men they brought plog fuel. Upon being told there were delays of 30 mins or so all went to STN.
3 Captains went in to the terminal, bought a postcard and sent it to the fuel supremo with the wording "weather bad, wish you were here".
Allegedly.
The only people I've heard about diverting due lack of fuel has been the chap charged with implementing fuel carriage policy.