I think, best case scenario, even if you got past Michael Savage's call screener, you'd likely still be on hold for an hour or two so a prank call to Michael Savage from the U.K. could be expensive.
Another thing to keep in mind about the top-tier syndicated conservative talk shows (i.e. Rush Limbaugh, Sean Hannity, Michael Savage, Mark Levin, Laura Ingraham) is that they all have a 15 to 30 second delay for profanity and pranksters so prank callers usually don't even get heard by the audience even when they get through to the host.
But even if only one-tenth of one percent of Michael Savage's listeners feel compelled to call on any given day, that's still around a thousand people you'd be competing with for a handful of caller slots. And if you wanted to talk to him when you're drunk, you'd have to be drunk by around 8:15pm your time to coincide with when he starts to take calls.