Purchase a smoke grenade. Select or hold the smoke grenade. Find another player(Preferably a team mate or if you are courageous enough you can target an opponent) Position yourself so that when he runs you are at the opposite direction running towards him. When the two of you collide, you will stop moving. At that precise moment throw the smoke grenade against him(between his face and torso)if you did it right the smoke grenade won't bounce off as usual, instead it will stick to him like glue. The target won't be able to move for some time until the smoke grenade loses its function and disappears. If you experienced being stuck by this trick try jumping continuously and shoot the smoke grenade by your gun or keep slashing it with your knife to set yourself free.