"Hello, young man, would you like a hotdog? You won't get it, that loud laughter you hear as Luke devours the hotdog".
To translate this into a detailed scene description for an AI image generator:
"A teenage boy with wide eyes and a hopeful expression is reaching out his hand expectantly towards a hot dog, but an older boy named Luke, with a laughing face, is already eating it. On the background, an out-of-focus crowd at a hotdog stand can be seen."
