https://www.theregister.co.uk/2019/12/13/science_solves_shaken_beer_conundrum/

Should you be faced with the horrors of a shaken can of beer and an urgent need to open it, science has solved the question of whether or not tapping the can helps reduce the fizz when it is opened.

Researchers from the University of Southern Denmark carried out a randomised controlled trial of 1,000 cans of beer (PDF). The cans were either shaken and not tapped, or shaken and tapped, or not shaken and tapped or indeed not shaken and not tapped. Clear?