A little boy in Japan had a special meeting with London mayor Boris Johnson.

During an informal street rugby match in Tokyo Thursday, Johnson knocked 10-year-old Toki Sekiguchi to the ground with a man-sized blow the school boy will not soon forget.

The mayor, who is on a trade visit to Tokyo, was invited to join in a little non-contact fun, which quickly escalated as Johnson, ball in hand, careened up the miniature pitch and directly into the elementary school student.

The mayor shook the minor's hand afterward and apologized, according to the BBC.

After the incident, Sekiguchi told the Guardian: "I felt a little bit of pain but it's OK," adding that his meeting with Johnson had been "enjoyable."

As a rule, touch-versions of sports don't involve tackling, though abstaining from a proper walloping is something the rugby-loving mayor has struggled with in the past.

He's getting a bit of a trouncing himself online.

Oh 🙈 <a href="https://twitter.com/MayorofLondon">@MayorofLondon</a>! He said in the words of chumba wumba 😂😂😂😂😂😂😂 <a href="https://twitter.com/hashtag/BorisJohnson?src=hash">#BorisJohnson</a> never fails to amuse me! Smh <a href="https://twitter.com/hashtag/business?src=hash">#business</a> <a href="https://twitter.com/hashtag/London?src=hash">#London</a> —@RoDejAn1

Boris Johnson is an absolute savage. That poor kid didn't stand a chance. —@croderick1982

Why does anyone find Boris Johnson entertaining? He scares the bejaysus out of me. <a href="https://twitter.com/hashtag/dangerous?src=hash">#dangerous</a> —@MatthewCull1

Though some think he should get off on a technicality.