It's an awful, awful idea unless you're talking about making uncontroversial but funny comments to people you still have good relationships with.
I mean fuck, I regret most of the "sober calling" I've done in the past, and most of the time I've already rehearsed it 100x more than is necessary in my head...
[BTW I also went out to Karaoke last night; fun time, but you need to rent a private room IMO]