Ok, every human who has ever entered a Masjid on Jumu'ah has experienced this.
The whole crowd rushes to the door. Or rather ... the sandal rack.
The first guy steps to the exit and ... DROPS his sandals on the concrete outside.
Then he stops, fumbles with his feet ... while TEN THOUSAND PEOPLE are waiting to leave the Masjid.
With a problem so common, you'd think all our Muslim engineers would have solved it by now?
C'mon you engineerians. Solve this dilemna for us.
How can we flow people out of the Masjid without creating a bottleneck??