Overheard in San Francisco

Young Homeless Guy is sitting on the floor with a cardboard sign. Another guy walks by, holding what look like large leftover bags from a restaurant.

Guy With Bags: [stops and offers the bags] would you like something to eat?
Young Homeless Guy: is there garlic or avocado in it?
GWB: I don't think so, why?
YHG: I am allergic to both. Especially avocado: when I eat it, my throat gets all scratchy.