When they call (and sometimes it's a woman's voice) I show thankful appreciation, and tell them I'm turning my computer on...and I tell them it's booting up, and in the meantime, I ask them what they think about 'reincarnation'.
Then, at least because they've never heard a native English speaker say the word, they're flummoxed, and I spend as much of the rest of the day as possible explaining karma.