The freaky, but generous, gesture is reportedly part of Japanese culture and came after Japan got their World Cup campaign off to a ideal start on Tuesday.
The country also made headlines for fans' tidiness at the 2014 World Cup in Brazil.
The two countries left the 15,000 volunteers working on the tournament in Russian Federation with a little less work to do.
Not even a win for Senegal in their first Group H in Moscow on Tuesday could temper an otherwise disaster-filled opening six days of the tournament for African hopes.
Denis Cheryshev, with his third goal of the World Cup, and striker Artyom Dzyuba then scored in quick succession before Salah won and converted a consolation penalty in his first game back after 3 1/2 weeks out with a shoulder injury. The 2-1 victory over Colombia yesterday was another surprising result in an unpredictable tournament.
Carlos Sanchez was deemed to have handled the ball and was subsequently red carded after just two minutes and 56 seconds - the second quickest sending off in World Cup history - and former Manchester United midfielder Kagawa capitalized from the spot.More news: ZTE shares plunge after Senate votes to veto Trump reprieve
But while fans of most victorious (or indeed losing) nations may have followed up with rowdy celebrations and heavy drinking, clips have emerged of both sets of supporters cleaning up after themselves by removing stadium clutter post-match.
"I'm certain that one day an African team, an African country, will win the World Cup", he added.
Senegal may have the most respectful supporters in the world. The Lions of Teranga's next match is against Japan on 24 June.
Africa's best performance at the World Cup has been to reach the quarterfinals, accomplished by Cameroon in 1990, Senegal in 2002 and Ghana in 2010.