What he actually said was "I think you're onto your last bagel unless you've bought some more."
There's nothing wrong with my organic hearing - I hear every syllable, ending in the right sound. But my brain is crap at decoding them into a sensible sentence.
It's not all the time - it happens more when I'm tired, or if I can't hear well to start with because of background noise etc. But it leads to Very Much Confusion.