I was fighting some monsters near an anvil with my crossbow, and I accidentally right clicked on it. My bolts got an enchant with +1 dodge and "it sends your enemies into a nightmare". Both effects don't work. I also did this from 7 tiles away
pulling a Maslech on a pile of softballs and then just continually adding more softballs to the pile, BTW, is great fun.
I kronged some food months ago to see what would happen and I think it used up the altar, destroyed the food, and produced some message about krong not being too impressed, but it was a long time ago. Of course I could probably check it again given a few minutes.
here is what i got: (it is the same whether you do food or drink. oddly enough, however, you still keep whatever you used on the anvil)
What were all those muscle diggles doing in one place together? Oh, wait, I don't think I want to know...
For the record, if Krong blesses the ammo with bonus damage, that damage does get applied when thrown/shot.