Unless you happen to be old footage from Bloodsport, you should never attempt to make fun of a Mentos ad. Those ads are so stilted, strange and exaggerated that parody is ultimately made redundant.
Yet,there are exceptions to every rule. Take for example this spoof from the Australian sketch comedy show Full Frontal. What sells this sketch isn't the weak punchline but rather Shaun Micallef's grotesque reaction shots.
I like the fact that his character seems to be getting turned on by the whole situation.