Last year, my buddy used a knife to cut out a small rock that had become firmly embedded below my knee after I "crashed" into a large granite boulder. So, yes, a knife and a good first aid kit can work wonders when you need them.

"Turtles, Frogs & other Environmental Sculpture"
www.quillansculpturegallery.comtwitter: @josephquillan
If less is more, imagine how much more, more is -Frasier