Very short version
Partner A picks up their lunch bag and drops a bottle of Coke that was in there. Bottle exploded, mess everywhere.
Long version
Lunch bad was a t the top of a cupboard that A can't reach (being on tiptoes allows them to grab the handle of the bag but not the bag itself iyswim). PArtner B has put the bag there open.
Partner B has been told numerous times that it's very hard for A to reach and to please not out the bag too far away/close the bag etc....
A also has a chronic illness that means they are extremely tired so the half an hour+ of cleaning on the top of day to day stuff (A cleans the kitchen in the am, prepare the evening meal if in slow cooker etc...) is likely to send them over energy wise. A doesn't not do that sort of cleaning (as in floors, doors etc) in the house on a day to day basis due to their illness and haven't done so for several years now.
So what would you expect to happen? A cleans, B cleans, A and B clean the kitchen together??