I agree with #2, that is terribly dangerous! Consider this: When you want to disinfect a surface, you can wipe it down with alcohol. This works because alcohol kills cells, primarily by disrupting the integrity of the cell membrane. You are made of cells. What do you suppose happens when your living cells come in direct contact with alcohol?
Alcohol is a central nervous system depressant. A direct injection runs a high risk of overwhelming the brainstem functions that control breathing and heartbeat, resulting in coma and death.