walkonby pink all day

I saw a joke from PTT.
It's funny~~~

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Mike is a student who is learning English.
One day, he collided with a cwhen he was walking.
Mike: I am sorry!
foreigner: I am sorry , too.
Mike: (sorry two??? I don't know this.)
Then Mike says............... : I'm sorry.... three..
foreigner: What are you sorry for?
Mike: (sorry four?? Then I must to answer a number.)
So Mike answer : I'm sorry five.
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HA