Joke about onion

- I want some onion.
- Excuse me, mam, but there is no onion here now.
- But I need onion!
- Excuse me, mam, again. I'm really sorry, but...
- You say - no onion?
- Yes!
- Hm… It was here two days ago!
- Very sorry! No onion now...
- But...
- OK, mam! Please, would you