To go from bar to bar collecting hand stamps at the entrances.
This weekend we're going bar hopping or stamp collecting.
An frivilous pursuit requiring only time and the ability to repeat things verbatim like a Parrot.
See Botany, Microbiology and Art.
Ernest Rutherford (1st Baron Rutherford of Nelson and known as the "father" of nuclear physics) was quoted as saying:
"Physics is the only real science. The rest are just stamp collecting."