Grampa came to visit in his RV which had a gas oven. I mindlessly turned knobs as most kids do.
Dad was a smoker back then, and would frequently walk into the RV with a lit cigarette.
Grampa lost his sense of smell years ago so he didn’t care.
By some miracle, Mum, who didn’t go into the RV unless absolutely necessary (because she hated the smell of cigarettes), walked in and realised the smell wasn’t from cigarettes.