Take Two

DD#1 was busy making hamburgers for her boys. They only like ketchup and pickles on their hamburgers, so she buys Stackers pickles - large pickles sliced lengthwise. Two Stackers are just enough to cover the hamburger. When the boys asked how many pickles they could have, she automatically answered "two" without looking.
Whoops! They weren't stackers, but the boys did only take the two they were allowed.