We use 10% of our brains. Imagine how much we could accomplish if we used the other 60%.

The line is a joke built on the popular (but false) “we only use 10% of our brains” myth. Its punchline—miscounting the “other” percentage as 60% rather than 90%—signals that the speaker is playfully undercutting the premise while also satirizing self-help rhetoric about hidden potential. Read this way, the quote isn’t a serious claim about neuroscience; it’s a comic comment on how easily people accept motivational clichés and how confidently they repeat bad math when inspired. The humor depends on the audience recognizing both the familiar myth and the absurdity of the arithmetic.