I once posting this issue in one of the 'things that annoy you' threads. The amount of foods that are labeled 'hot' with 4-5 chilli stars and not remotely warm.
Another shout out for walkers max (the buffalo chicken wing or cheese ones especially). I can manage these with a few cans and definitely spicy enough. I stick Chilli's in everything from stir fries to salads so think I'm pretty good with the spice.
I recently tried the Doritos flaming hot tangy cheese and I couldn't manage them. It probably the first time a 'hot' crisp has done me. I had 5-6 and just didn't enjoy them due to the heat.
I remember going to Thailand and asking to make my noodles more spicy. Trust me don't ever get that confident