Has anyone actually gone shot for shot with someone?

My buddy and I are both Marines and we always drink like crazy at parties and take pride in how much we can drink without passing out. We eventually decided we want to go “shot for shot” with each other to see who has the higher tolerance. Like how you see in the movies/cartoons where each person takes a shot at the same time one after another until someone taps out or can’t drink anymore. Has anyone actually done this? How would you go about this, like literally one shot after another or give it a few minutes in between? Thanks for any stories or advice!