Precious mug left dirty next to the sink to be washed as if by magic later.
Mug put into the dishwasher with all the other pots after dinner.
Mug is clearly not dishwasher proof.
So the fault of the person who left it or the person who put the "obviously" not DW proof much in the machine or the person who thought a non DW proof mug made a cute present ?
Mug was given to teen DS by his girlfriend, hence the magnitude and huge emotional fallout of the disaster