As I walked past the fruit bowl with my breakfast this morning I noticed the avocados were ripe enough to go into the fridge. "I must put those in the fridge after I've finished my eggs".
Finish eggs; clean up plates; start organizing lunch. "Oh, I must remember to put those avocados in the fridge"
Lunch organized and in bag; half-way up stairs to get dressed: "Oh, I must remember to put those avocados in the fridge before I leave the house"
Dress; Clean teeth; Apply lipstick – mentally remind self again about the avocados.
Half way to work on the train: "Oh, damn, I forgot to put those bloody avocados in the fridge!"