Go into the editor and place say a wall like this:
class Item0
{
position[]={2162.7915,-1.7642975e-005,5564.438};
azimut=9.5163603;
id=16;
side="EMPTY";
vehicle="land_mil_wallbig_4m_f";
skill=0.2;
init="this call {_r = getpos _this; _r set [2,-1.7642975e-005]; _this setpos _r}; this allowDamage false; this enableSimulation false;";
};
then save it into a MP Mission and host it on a dedicated server and go and throw a grenade at the wall, and it will fall over even though damage and enablesimulation are false. I have also tried with numorous other walls and they all fall over...