More and more "subway acrobats" are flipping and spinning their way into handcuffs.
The New York City Police Department is cracking down on performers who take over subway cars for their shows and sometimes ask for money.
Police say 182 people have been arrested for reckless endangerment and disorderly conduct related to acrobatics as of last Sunday.
Fewer than 40 arrests were made during the same time period in 2013.
Some acrobats say they are just out to entertain and make a living.
While no injuries have been reported, Police Commissioner William Bratton and some straphangers said safety is a concern.
"That behavior's not appropriate on a subway car," Bratton said. "It's very dangerous both to the acrobats themselves as well as to the riding public."
"I think it's pretty crazy that they do it because I think it makes everyone else uncomfortable," said one subway rider.
"I like to try to rest and relax and not worry about people falling on top of me," said another.
Bratton said the crackdown is part of an effort to go after minor offenses as a way to prevent major crimes.