What's the difference?

The Proper King's English
English majors and wordsmiths will appreciate
this old and fading art of writing:

Capitalization
In this world of hi-tech, I have noticed that many
who text message and email have forgotten the
"art" of capitalization. Those of you who fall into
this category, please take note of the
following statement below:

Capitalization is the difference between
Helping your Uncle Jack off a horse.
and
Helping your uncle jack off a horse.

Punctuation
Look what a comma can do.

"Let's eat, Grandma!"
and
"Let's eat Grandma!"