Any time I have EVER been to a Subway, if I say "I'll have the tuna sub", the first thing I'm asked is "Half or Whole?" or "6-inch or 12-inch?". If her son was instructed to order the footlong and just said "Roast beef sub", he would have been asked to specify size, would he not?

I imagine the cashier might have been more accommodating if she had been approached in a more conciliatory manner instead of being made to feel that Subway did something wrong by giving little Timmy exactly what he asked for.