In a dingy, blacklit room that smelled of piss and cigarettes, we watched 5 disinterested women well into middle age do strange things with eggs and needles and glow-in-the-dark rings. It's boring and rather sad, but that's not the worst part.
The place that we happened upon was not a safe place to be, evidenced by the shouting matches between clients (usually foreign tourist couples, sometimes with kids) who were getting ripped off to the tune of $250 (Yes, that is 8000 baht) for a couple beers. If you don't pay, you're surrounded by shouting women who don't let you out, as well as a few thick-armed thugs who glower and guard the door. It's pure intimidation and extortion, in a dark, strange, disorienting room. Police are not allowed in (they carded my Thai friend to make sure he wasn't police) and you really have no legal or personal protection once you're inside. I assume most people pay and get the hell out.
After about 10 minutes of watching this, and getting dripped on by a leaky air-conditioner (liquid in a run-down strip club ain't cool) we decided to leave. There was a glass on our table of orange soda with a straw in it. It wasn't ours and I moved it to an empty table. In that glass was the scam -- that orange soda cost 3200 Baht, or about $98. After arguing with a Thai woman who spoke to me with a ferocity that gave me goosebumps, we paid for what we drank (400 baht for 4 beers) and left. A bouncer shoved me around a little bit on the way out for good measure, and that woman told me to 'shut my mouth' about her scam. They attempted to charge us eight times our bar tab for that single orange soda. I was sober throughout, which made the visit even less pleasant.
To all who think this is 'part of the Bangkok experience' I assure you it's not. There's nothing Thai about it, actually: Thais don't scream at guests, they don't intimidate tourists, and they certainly don't pull sharp things out of their private parts. The only thing that's Thai about it are your own preconceived notions (which some unsavory characters will happily indulge for financial gain). It's also disgusting, and can be dangerous.
If you want to experience the rougher side of Thai culture, go to a kickboxing fight and sit high in the stands at Lumphini Stadium. Place a bet or two with the bookies if you want, drink some cold Chang from plastic cups, dig the old music and watch the rats scurry beneath rickety stands. You'll lose a lot less money, and have a lot more fun.