or they make the toaster to slightly and unpredictably vary the quality of the toasting - not enough for you to notice anything specific, yet enough to make you

or they make the toaster to slightly and unpredictably vary the quality of the toasting - not enough for you to notice anything specific, yet enough to make you start the day with a bit of puzzled annoyance and undermining your confidence in your perception of reality - "was the toast different yesterday or is it just me?" - and leaving you with something bugging at the back of your mind through the day making you a bit impatient, a bit more easily frustrated, distracted and having some unspecified resentment building up deep inside you more and more with every day...