My mother has this habit of telling me how full something makes her, and how if I eat the same thing I should stay full forever. She'll go on and on about how this or that will hold her (and thus, me) over until lunch time 100% guaranteed. When I don't stay full, or I go back for something else, it's suddenly a Big Deal, even if we have an argument beforehand about how I probably will need to eat something else. She'll stand there scratching her head about it and wondering aloud why I'm still hungry, or how she can't believe the food didn't work, etc. This happens enough that it irritates me.