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What happens if an electron collides with another electron?

**We know that electrons always repel electrons. But, if somehow they collide, then what will happen?**

I found a related question of above one in [Quora](https://qr.ae/pGOZgU).

>An incoming electron can instead make them both bounce away.
>
>Two free electrons will bounce off each other unless perfectly aligned. In which case, both explode and produce photon(s).

I agree with his first statement. But, I am in little bit of confusion of second statement. I know that if electron and positron collide, then they will form photons. 

But, none of his statement answers my question.