Beer tapping is a classic practical joke among pub goers. It can be accomplished by hitting the top of your mate’s open bottle of beer with the base of yours, generating an impressive explosion of foam which covers said mate’s hand. A scientific paper was recently published in the journal Physical Review Letters, which investigated the phenomenon to determine how and why it happens; with wider relevance to more, ahem, serious research, such as volcanic eruption! This video illustrates the process in cinematographic form, but for a visual explainer, look below!
The Art In Science 