This usually happens because there is built up pressure in your eustachian tubes. Me and people in that sub are able to open theirs on command. Its a super power.
I tried re-creating it here on lemmy the other day but the Create New Community button circle just kept spinning :(
One time my hearing got kind of weird and muffled, so I went to the ENT and he used a little wire loop thing to remove a bunch of wax. It was incredible, all the high end immediately came back and everything sounded so crisp, in this quiet room with just normal fan whirrs and machine hums. 10/10 would recommend.