A Chinese Joke

Do you understand this joke. Here is the explanation.

A guy asks:
过期三天的牛奶还能喝吗?
ɡuòqī sān tiān de niúnǎi hái nénɡ hē ma？
Can I drink the milk (when it is) three days overdue/past use-by date？

Another guy says：
怕什么，还有三天到生产日期的牛奶我都喝过！
pà shénme，háiyǒu sān tiān dào shēnɡchǎn rìqī de niúnǎi wǒ dōu hē ɡuò！
Don't be afraid, I have ever had always drunk the milk 3 days before production date!

<em>(confusion of ever, never, always, once, sometimes is very common!)</em>

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Words Bank:
过期 ɡuòqī overdue/expired 
生产 shēnɡchǎn product, to produce
日期 rìqī date

Phrases to learn：
怕什么？ pà shénme？Don't be afraid/What are you worried about?. (word by word, scare what?)