Manipulating Ping

As odd as it may sound, I am looking for a simple way to manipulate my ping (mainly for online gaming). Purpose is for game testing, trying to find exploits and bugs, etc. So basically, is there a script I can write or settings on my router I can adjust to tweak my connection? More so, I am looking to achieve a certain ping when I play. Say I join a server in a game, and I have a stead 34 ping, but I would like to get to a solid 120 ping. Then, if wanted I can turn said script or adjustment off and have my ping return to normal. Is this possible? Or not at all?
 
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