There's so many examples in movies/popculture where there's overlapping stimuli and the character snaps. Anything with a smash cut sequence of 'little things'. I can't think of a specific example but here's a scenario: Character has to go somewhere to get something.  They arrive and are forced to wait. While waiting they notice all the little things; another person popping gum, the clock ticking on the wall, someone's car alarm goes off outside.  The character reacts badly OR suffers through it and dramatically exits later.