A few years ago, all stressed about finding something allergen-free for DD to take to school on her birthday, I went to the school's office to discuss the options with the staff just before pickup. At the time I was very sleep-deprived because of 2nd DC who didn't sleep well at night. When I went a few minutes later to pick her up, the teacher asked to talk to me for a second. While being all fussy about allergens, etc. with the staff because I honestly was worried about DDs classmates (DD doesn't have allergies), I had included in her lunch bag walnuts as a snack!!!