There’re many funny expressions in the German language too like the “Butterflies in the belly” for a person having fallen in love our the “Goose skin” as a reaction to a positively moving experience which can really be seen as a physical reaction of the human skin but I nevertheless have this bird in front of my inner eye when people use this expression. “Opening a new barrel” is something similar to the “can of worms” but rather refers to mentioning something often controversal that triggers a new discussion which you rather want to avoid late in the evening or with a choleric person😉.
I mostly use dict.cc for finding out the sense of such expressions in the English language so that I found out that @spikeyxxx didn’t think at a Spanish dish when talking about “pita” in a post 😉. I also memorized @blanchsb ‘s TLC 😀.