Had to include this classic...
Nothing really troll-like, its a perfectly legitimate trap.
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The best kinds of boulder traps are the kinds that allow you to push towards the boulder source at the cost of being slower in the short run and more dangerous, yet more rewarding (like beating level faster) or allowing you to run the direction the boulder travels, basically negating the danger of the trap at the cost of having to play more level and/or progress slower in the long run.
Doing this kind of trap only takes three to five entities in it's simplest form (func_physbox, logic_timer, point_template, and optionally some kind of initial trigger and/or stopper and further optionally something that destroys the boulders so that they dont pile up somewhere (a trigger_hurt works perfectly here))
