Ern sent me a link to this new amazing discovery. Apparently Grey Goose, Belvedere, and Ketel One can all suck it, thanks to Brita water filters. I haven't confirmed the experiment (yet!) but I'm always looking for a reason to buy that giant bottle of Kamchatka vodka.
[UPDATE]: I tried this out this past weekend. After 5 passes Mr. Boston was easier to drink than Grey Goose.