lose the plot
To cease to behave in a consistent or rational manner.
I lost the plot for a while then. And I lost the subplot, the script, the soundtrack, the intermission, my popcorn, the credits and the exit sign.
plot
UK /plɒt/ US /plɑt/
noun 5verb 3
Definitions
noun
1
The course of a story, comprising a series of incidents which are gradually unfolded, sometimes by unexpected means.
If the plot or intrigue must be natural, and such as springs from the subject, then the winding up of the plot must be a probable consequence of all that went before.
2
An area or land used for building on or planting on.
3
A grave.
He's buried in the family plot.
4
A graph or diagram drawn by hand or produced by a mechanical or electronic device.
I was told to fly out on a vector of 100 degrees to meet a strong plot of aircraft 30 miles from the coast.
5
A secret plan to achieve an end, the end or means usually being illegal or otherwise questionable.
The plot would have enabled them to get a majority on the board.
The assassination of Lincoln was part of a larger plot.
verb
1
To conceive (a crime, misdeed etc).
They had plotted a robbery.
They were plotting against the king.
2
To trace out (a graph or diagram).
They plotted the number of edits per day.
3
To mark (a point on a graph, chart, etc).
Every five minutes they plotted their position.
This treatise plotteth down Cornwall as it now standeth.
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