In China, a man went to the toilet and his toilet caught fire

In China, a man went to the toilet and his toilet caught fire. I immediately want to joke that it’s time for him to stop eating spicy food and be less nervous. However, the poor guy had no time for jokes. According to him, he was just sitting on the toilet when suddenly white smoke began to appear, which suddenly turned into flames. Why do you think this happened?

Understandably, a heated discussion immediately broke out on social networks (excuse the pun). Some commentators believe that there could have been a leak of methane, which was ignited by a thrown cigarette butt, since similar cases have already happened before. But there is no clear version of this “riddle of the hole.” Well... thanks for the new phobia.