I know a Russian drinking song that I once learned when massively hammered, so much so that it only resides in the Drunk Memory levels of my brain.
If I start singing it, it's generally a clue that I am incredibly drunk, even by my own "two bottles of wine is merely a beer chaser" level of liver poking idiocy (to be fair, most people will have buggered off by then because the "I want to snog everyone" drunk level often kicks in before the Drunken Russian Singing level of insobriety).
If I'm really bad I do the 'Evil Jimmy Saville' impression.