Pope Francis is often pictured as calm and collected, but his normally smiling face turned in to a look of anger as he scolded a person in the crowd. During the pontiff's visit in Mexico, he showed a rare moment of irritation when he interacted with an overly enthusiastic crowd member.

The Pope was greeting a crowd when someone in the audience grabbed him by the arm and wouldn't let go. The crowd member ended up pulling the pope down onto child in a wheelchair. The pope "raised his voice and said twice in Spanish: 'Don't be selfish!'" Reuters published. With the assistance of security personnel, the pope regained his balance

After the incident, an announcement came from the speakers. The announcer advised the crowd to remain calm. "Please contain yourself. Pope Francis wants to greet us, but if we pile up, it will be difficult to do so."

Watch the clip below:

Pope Francis is known for interacting closely with the Catholic faithful. The pope wants his "Popemobile" to be open instead of the traditional bulletproof to let the crowd see him as he move around. Some security analysts see this decision as a security nightmare for the pope's aids.

But the incident in Morelia might force the aids to tighten Pope Francis' security.

On Wednesday, the Pope visited the notoriously violent city of Juarez, Mexico. The city is also known as the "murder capital of the world." Estimates show there is a high homicide rate in that city, and most of the victims were young women employed by foreign-owned factories along the border.

It is also worth noting that the pope visited a notorious prison, saying he could not ignore the most marginalized of Mexican society.

During his motorcade in Juarez, an estimated 70,000 people formed a human chain along the route.

According LA Times, tens of thousands of people gathered on U.S-Mexico border to hear the message of the Pope. The border fence is also filled with flowers in memory of the 6,000 migrants found dead on the border of the US.

Pope Francis' message centered about the need for fair wages, human dignity and an end to the violence convulsing Mexico.

Time said the pontiff' six-day trip to Mexico will likely become a political touchstone for the U.S. presidential campaign. The Pope's border mass comes right between the New Hampshire and South Carolina primaries.