well, if your imaginary friend can make it rain... then he would also have the ability to make it NOT rain, which he so thoughtfully has apparently already done for you. You may want to consider that your imaginary friend thinks you suck, therefore begging from him would just piss him off even more, sort of like when Rick Perry led the prayer vigil for rain. It didn't rain.
It will rain when the atmospheric conditions for precipitation occur, and not before.
Maybe beating on a bass drum and dancing around a bonfire naked at night might work, but it would sure weird your neighbors out.
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