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The guy and I were trying to figure out the end of the Surprise Symphony theme from memory. We hummed it and kept thinking it was C-C-B-B-C-C, but whenever we played it, it was obviously wrong.
So, we looked it up. It's C-C-F#-F#-G-G. The last two notes were exactly a fourth below what they actually were.
This has happened to me before. So, if something seems off while you're transcribing, try shifting by a fourth or fifth.