Well....we did try a sizzling seafood platter at one Thai place that probably went to 8 on a scale of 1-10.
We love hot food, altho DH can take more of it than I can. But this was almost too hot for him! The restaurant runs an in-house competition: if you can finish the dish by yourself in 30 minutes, they will put your photo up on their "Wall of Flame Fame"!
The spicing on the dish is very complex. Beyond the heat, you can taste really wonderful spice and herb flavors.
We've had Mexican food that's almost as hot, but I think they were taking pity on us and making it less hot than they liked to do, because it was so obvious we really didn't belong there. It's actually not far from where we live, but few Asians or Caucasians live in that neighborhood. We're Asian, and the menu was entirely in Spanish, LOL.
Fortunately one waitress spoke English, and I knew a few food items in Spanish so we could figure out what to order. To this day my DH swoons in memory of their shrimp and sea bass aguachile, which was really sensational.