The more of me that you take the more of me you leave behind what am I?
Footsteps.
it is raining and 7 guys leave a building in a group. none of them have any rain gear but only 6 get wet. HOW?
They were heading toward a fire truck and it was raining because the first one turned the hose on the rest.
Or, more seriously, the seventh man (the dry one) was in a coffin and the other six were pall bearers so they got wet as they carried the coffin.
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1) I am the start of war and end of sorrow. You can't express wisdom without me but I am the heart of dimwits. You may find me in waves but never in oceans.
2) A pack of hungry wolves are chasing you. You run till you come across a dilapidated house with three rooms. The first room has weapons hidden all over which may fire anytime. The second room has a ferocious lion which hasn't eaten for many weeks. The third room has vials of sulfuric acid located near the ceiling which may drip anytime and corrode one's skin. Which room will you hide in to escape from the pack of wolves?