When a girl has her period on your bed and then jerks you off onto the period fluid and somehow your semen fertilizes the egg. Then a kid grows on your bed.
The distinctive smell of the multiplex cinema showing this season's action pic, favoured by adolescent boys. Hot buttered popcorn and farts defying the best efforts of mechnical ventilation.
The lingering memory of Spiderman was the smell of a combined hot-buttered fart from the three previous sessions.