Out of hand
Definition 1 of 2
Pro Tip 1/3Control Lost
Used when a situation becomes too difficult to manage or oversee. 
The demonstration quickly got out of hand, with crowds blocking the streets.
Pro Tip 2/3Negatively Spiraled
Often implies that an event or behavior has deteriorated in a negative way. 
Their playful banter soon got out of hand and turned into a serious argument.
Pro Tip 3/3Intervention Needed
Suggests that some external help or action is required to regain control. 
The kids were so noisy and mischievous; the situation was getting out of hand.