[jakobnev]

Originally Posted by cRiPpLe_rOoStEr

That's a reason why I prefer to disconnect jumper cables only when one of the vehicles had already been shut-off. And actually I prefer to avoid resorting to jumper cables anyway.

This is the reason that the last connection you make is done at a ground point away from the battery. When you disconnect that is the same connection you remove first.

The cars being turned off doesn't really help you, you can still get a spark.