My mom used to pack lunches for me every once in awhile when I was in school if I was pressed for time in the morning. One morning, we were paricularly behind schedule, so she gave me the sandwich my father had forgotten to take to work (my father is a notorious "garbage disposal"; he will literally eat nearly anything).
This landed me a peanut butter and liverwurst sandwich.
On another occasion, she thought she would be nice and make me a ham and cheese sandwich (I normally ate peanut butter and something; jelly, cheese, or dill pickles). We were both very tired that morning, and when lunchtime came around I discovered that she had lost track of things and given me ham, cheese, and peanut butter (and the plastic was still on the ham).