1. Goals are difficult to score (despite the large net)
Great saves by goalkeepers in the last 50 years.
2. An attacking move may start well before the ball is near the goal
This two-minute video of Spain in 2011 creating holes in Scotland defense with crisp passing.
3. Players dive (acting)
Sometimes falling down a little too easily is okay to signal to the referee (who may be out of position) you were fouled is acceptable, but intentionally trying to trick the referee is going too far.
4. Penalty shoot-outs are the most dramatic moment in sports
Video of Italy vs France in 2006 World Cup Final.
5. Players are fit
There are only three substitutes allowed per team per game (some players may run over 9 miles in a game).