As a general rule of thumb, having a knife in your back is not a good thing. I would also recommend that if someone is planning on sticking multiple knives in your back, then you should take precautionary steps to ensure a knife-free back. If left untreated, there may be slight discomfort when laying down.
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i always sit with my back to the wall...
Thankfully, we know that walls don't have knives...just ears.