the Horizontal line of you bed to the vertical lines of your bedposts
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If the walls in your house were not perpendicular they would probably topple over and you would no longer have a daily life for perpendicular lines to affect.
Perpendicular lines cross creating 90 degree angles. Examples would be intersections in city blocks or a cross.
A plus sign (+) would be a pair of perpendicular line segments.
I believe they have Negative Slopes as stated by my Geometry Book. "Perpendicular Lines Have Slopes Which Are Negative ___"
A line that is going straight up is perpendicular to the floor. A line that is leaning over is not perpendicular to the floor.