3. Gravity Gun

Half-Life 2

The Gravity Gun has an obligatory spot near the top of almost any gamer's list of favorite weapons, despite the fact that it was little more than a way for Valve to show off Half-Life 2's sexy physics engine. Somehow it came to embody the iconic series just as much as Gordon's crowbar ever did, and we still can't pick something up in games like Singularity or Skyrim without thinking of that pseudo-zombie level with all the saw blades in Half-Life 2.