"Oh, it can happen numerous times," Wesley replied, a faint hint of a smile twitching at his mouth. "Souls are surprisingly volatile. The same vampire I described to you lost his soul a second time due to a gypsy curse that was put upon him that stated that if he ever achieved perfect happiness, he would lose his soul. Unfortunately, he wasn't made aware of that clause."

This is what happens when people don't read the fine print.