I think the cashier question is getting some answer that are based more on 'make smalltalk' and 'get her interested in you' than that they're actually answering 'how to ask her out'.... But since I have an answer there I don't feel really comfortable moderating those:
https://interpersonal.stackexchange.com/a/11021/1599
https://interpersonal.stackexchange.com/a/11017/1599