Gun Toss - The T and CT throw a deagle from a height/location of the T's choice, usually from a ledge. The player to throw their deagle farthest wins. Contrary to popular belief, "no slidesies" is not actually a rule.
Shot 4 Shot - The T and CT stand against two walls or on two lines selected by the T. They then take turns shooting at one another, one shot at a time, with a sidearm of the T's choosing. The first to kill their opponent wins.
Jumping Contest - The T and CT both jump as many times as they can in the time limit. Bonus points are awarded if you can win without looking like an idiot.
Dodgeball - The T and CT are both reduced to 1 HP and are armed only with flashbangs. They must both throw flashbangs at their enemy - like dodgeballs - until one of them is hit and dies, leaving them rather embarrassed for the rest of gym class.
Russian Roulette - The T and CT are frozen facing each other and one is armed with a deagle. They take turns shooting each other until someone fires the bullet and kills their opponent. The last known champion was Christopher Walken (R.I.P.).
No Scope Battle - The T selects a type of sniper rifle and both players are armed with it. They then attack their opponent without using the scope. Rambo + Sniper Rifle = Fun.
Clip 4 Clip - Similar to Shot 4 Shot. Both players stand against a wall or on a line selected by the T, and shoot at each other with a sidearm selected by the T until one of them dies. The difference from Shot 4 Shot is that instead of shooting one shot at a time, they shoot one clip at a time.
Brink of Death - Both players jump from somewhere on the map and attempt to take the most damage they possibly can without dying. They just want the attention, man.
Shotgun War - The T and CT are armed with shotguns and shoot at each other until they die. Other CTs should do their best to not move into the line of fire, lest they be mistaken for the chosen CT and find themselves horrifically disfigured by a shotgun blast.
Hot Potato - One player is given an unloaded gun, the "potato," and must try to toss it into the other player's hands. Whoever is holding the gun when time runs out dies. Do not try to eat your potato, as metal does not taste good.
Rock Paper Scissors - Both players chose Rock, Paper, or Scissors and live or die by their choice. Paper defeats Rock, Scissors defeats Paper, Rock defeats Scissors. If you don't know how to play this game, you lead a sad life.
Knife Fight - The T selects what kind of knife fight they'd like to have (Normal, Drunken, Low Gravity, etc.) and the T and CT then try their best to disembowel one other.
Race - The T selects a start location and an end location. Both players then race from the start to the end. The player who wins get to watch the other one trip over their own feet and die.
Chicken Fight - Both players attempt to jump on their opponent's head in order to kill them. You want to be the hen, not the egg. Being smothered by a warm butt is not a classy way to die.