Real sacrilege is the contemptuous irreverence shown for sacred things, especially the seven sacraments or anything used for divine worship (altars, vestments, chalices, tabernacles, et al.). This can happen first of all by the administration or reception of the sacraments in the state of mortal sin as receiving the Eucharist in mortal sin, as also by advertently doing any of those things invalidly. Using sacred vessels for secular use, such as a chalice to drink cocktails, or using common items like paper plates and Styrofoam cups for liturgical worship, are also examples of real sacrilege. The worst kind, again, is the desecration of the Blessed Sacrament, as it is the most important and most sacred item in Catholicism (far more than any relic or historical artifact whatsoever).