I can't say I've ever put my cell phone in my back pocket (much less had my butt cheek inadvertently dial someone's phone number), but I can admit to the fact that my phone has accidentally started calling people when I didn't ask it to.
I, of course, blame the phone.
3.9 million butt calls in a year? Now I've heard everything.
See related post: "'If guns kill people, do pencils misspell words?'"