Why does my car battery terminal spark when I try hooking it back up?

So when I try putting on my negative terminal my car will spark which worry's me so now am thinking of getting my car towed or having my mechanic friend do it. Can anyone explain to me what's going on? So when I put my battery terminal on I'll put on the with positive cable Red first but I don't tighten it.. 😂 then as soon as I try putting on negative battery cable Black I get a spark. O yea am losing a replacement for my positive cable since it broke
Why does my car battery terminal spark when I try hooking it back up?
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