• Industrial fan pushing the poster
  • Wooden pole stuck between poster and opposite wall
  • Inflate a giant balloon / zorb to push poster against wall
  • String / poles running along adjacent walls applying pressure
  • A constant barrage of nerf bullets
  • Cover the wall in jam then apply poster
  • Tiny metal filings on the dark part of the poster then use a strong electro-magnet to pull the filings and poster into the wall
  • Fill room with gelatin to secure poster against wall
  • Fill room with water and freeze it, slide poster in place
  • Rotate room 90° and place poster on the floor
  • Hold a competition for a car, but the rules are that the last person touching the poster gets the car - the poster is not allowed to move