Several celebrities have revealed that when they suffered heart attacks, they didn't realize what was happening until it was almost too late. Keep reading to see which stars nearly ignored the warning signs ...MORE: Follow Wonderwall on MSN for more Drew Carey almost missed his heart attack Lisa OConnor/AFF-USA.com / MEGA Drew Carey recently opened up about his experience on Ted Danson's podcast, "Where Everybody Knows Your Name," recalling how he initially mistook the warning signs.