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I couldn't understand the use of should in the following text. To me, there is no need of should.

If this door should fall down, or ha, ha, anything else, uh, this is the number for our Baltimore field office. Now they know that you're with me. You call them if anything should happen.
Comments  
It expresses an unlikely hypothetical situation (or at least a situation they want to give the impression that it is unlikely.)
if ... should ... can be paraphrased if, by chance, ...
If, by chance, this door falls down, or ...
You call them if, by chance, anything happens.
Alternately, if it turns out that ...

If it turns out that this door falls down, or ...
You call them if it turns out that anything happens.
CJ
Students: We have free audio pronunciation exercises.
Question 1:
Is the following sentence correct?
I will try to be back as early as possible. In case, if I should get late, then call the police.

Question 2:
nona the britIt expresses an unlikely hypothetical situation (or at least a situation they want to give the impression that it is unlikely.)
Doesn't unlikely and hypothetical mean the same? If that's the case, then I would have used only one of them, not both.
Jackson6612Question 1:
Is the following sentence correct?
I will try to be back as early as possible. In case, if I should get late, then call the police.
Try this:
I will try to be back as early as possible. If I'm late, call the police.

Although, how is anyone to know whether you're late or not? "As early as possible" leaves the matter pretty wide open.
Unlikely and hypothetical are not the same. In a hypothetical situation, it's just something that could happen and is not happening right now. Questions that starts with "What would you do if..." addresses a hypothetical situation.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thank you, RayH and Barbara.