Stretching Your Legs

Stopped for a rest on my drive back home
Got out to stretch my legs
When I got back in I noticed a change
It surprised this hard boiled egg

The gas pedal was closer than it was before
A fact it made me holler
“What's going on? I'm really quite spooked!”
“I must be one foot taller!”

Now I know it's just an old expression
You don't literally stretch your legs
But for someone learning the english language
These nuances are hard to peg

“Coz if the stretching were really true
I'd soon be over eight feet tall
I'd have to build a room with extra high ceilings
So I don't bump my head and fall!