When you introduce your girlfriend to your Best friend and after some time they start dating each other and you are unaware of the situation but after sometime you get to know about their relationship , now you're really pissed and want to take revenge, then you remember that the girl's parents are strict af and you know that they won't tolerate that their daughter is in relationship
so, you tell her parents about her and
they decide to send her to a different school located in another city
The End

tl;dr
When two pointers are pointing to a same memory location then if any one of them deallocates the memory, the other pointer becomes a dangling pointer
:v