'Oh right I need to do that thing okay but I have to do this other thing first so-' and then it falls off the stack.
Get up to go make food, the stack is:
'Make food'
In the kitchen it becomes: 'Get a drink, make food'
Cat begins fussing at me: 'Give cat treats, get a drink, make food'
I see the dishes need to be done: 'Give cat treats, get a drink, make food'
At some point, something / everything falls out of the stack. And this is what the neurotypical types don't understand. If I, say, walk out of the kitchen for some reason (e.g. need to use the bathroom)... the whole cycle resets and I don't remember 'make food' for possibly hours.