"Home Alone 3" was probably a bit of a mistake. Macauley Culkin pretty much made the first two movies, and without him in the lead role it just didn't feel the same, however hard the studio tried. And they really did try - they even gave the lead character a house that actively gifted weapons for the resourceful starring character to use!
Here we see him open a closet door, which contains nothing interesting other than quite a nice looking chair (and what's that doing in there anyway instead of being out in the open where somebody can sit in it?). When the shot changes, though, there's a nice thick black bar on the floor for him to pick up. It absolutely wasn't there when the door was opened, so the house must have conjured it up for him. Now, that's what we call a home defense system!