Hard liquor up the ass is VERY dangerous. It gets absorbed through the rectal wall in the same way suppositories do. This way, the booze isn't filtered by the liver so it takes much less to cause alcohol poisoning than by drinking it. It also will absorb rapidly instead of over the course of an evening, so it would hit you before you realized how drunk you were.
I have tried very diluted booze up the ass to see if it would work, and it gave me about 1-2 drink buzz. A straight vodka tampon... nooo way.
ps the video is broken.