Do you often cry while having a warm feeling in the heart because you find something beautiful? If so, you might be intrigued by this study of the Geneva Sentimentality Scale!
(cited in Gillies’ “Philosophical theories of probability”):
“Against this view [operationalism] it can be shown that measurements presuppose theories. There is no measurement without a theory and no operation which can be satisfactorily described in non-theoretical terms. The attempts to do so are always circular; for example, the description of the measurement of length needs a (rudimentary) theory of heat and temperature-measurement; but these in turn involve measurements of length.” (Popper, Conjectures and Refutations, 1963)