To top/cap it all
Definition 1 of 1
Pro Tip 1/3Emotional Intensity
Conveys frustration or disbelief after a series of bad events, showing emotional buildup. 
My whole day was a disaster, and to cap it all, I spilled coffee on my shirt.
Pro Tip 2/3Climactic Usage
Used at the end of a list to emphasize that the last item is the most surprising or significant. 
She was late, forgot her notes, and to top it all, she realized the meeting was yesterday.
Pro Tip 3/3Negativity Highlight
Generally highlights negative events; rarely used for positive or neutral situations. 
There was heavy rain, thunder, and to top it all, a blackout.