If you play with fire, you get burnt.

A warning that dangerous or risky actions often lead to pain and injury. It's no surprise that Jeff ended up in jail after getting involved in that counterfeiting scheme. If you play with fire, you get burnt. Asking out Dave's ex-boyfriend seems like a bad idea. If you play with fire, you get burnt, you know? What, did you think I was just going to let you spread nasty rumors about me without retaliating? Please—if you play with fire, you get burnt.