Oh, this was hilarious! Especially the segue from needing to use the loo in to the lore about vampires and running water.
The "MythBusters" approach... how long has that show been off the air now? Anyway, the entertaining (for those of us who remember) use of the MythBusters framework (and a co-host wearing a beret) reminds me of a similar effort I undertook using my Pinky Street figures, way back in the day; which, coincidentally, also examined a supernatural legend.
Sure, I'll bogart this topic with a Pinky Street story:
MYTH MASHERS (2007).
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(Got curious, hadda look it up: MythBusters ran from 2003 to 2018)