Themostnotoriousofthesewasthe 1952 stinkercalledMySontheVampire, whichdidstar a late-careerBelaLugosi, buthedidn't play a vampire, andnooneelseinthecastdideither.
Theconsensusthinkingisthatwhenyouhold, itcomesfromthehabitorsomethingpeopledidofholding a mirrorupto a deceasedperson's facetoseeifthewarmbreathwouldfogupthemirror.