If he plays the French, I'd go with the WinDaver.
Unnerve an opponent?

You should consequently explain your own plan, from the very beginning of the game. Also keep explaining to your opponent why their plan won't work. Explain fast and just improvise long reasoning sentences that seem to be full of logic but really isn't. If possible, get them dragged into the 'logics' of the reasoning and produce arguements that doesn't make sense, but strangely, seem to make sense.
if you try the farting suggestion you must play the TRUMPowsky attack.