I love the rubber bayonets.
We used to do post battle hospital demonstrations with make-up.

We've made people throw up before.
We used to do arty wounds, so there were lots of splinters, missing limbs, etc.
We had one guy, who was really skinny and flexible, so he would fold his leg back and you'd swear he was really missing his leg!
One year, (about 5 years ago) we had the public carry back the wounded soldiers after the battle to the field hospital. My son was with me that year and dad din't come home from the battle. Well, I was carried back, with my head wound and dumped infort of the hospital, where my son was waiting for me (it was part of our camp). It was interesting to see my son's reaction.

I didn't break character and kept a stone cold face. My son came up to me and poked me lifted my kepi off my face and stayed by my side during the whole demonstration. Finally, the surgeon came up to me and said I was "done" and moved on. There were a few people crying when they realized what was going on, as his reaction was real. He just stayed there by my side silently.
I finally got up and gave him a hug. He was pissed though.