What is as big as a horse but doesn't weigh anything?!

Question: What is as big as a horse but doesn't weigh anything!?
Answers:

Maybe a horses shadow!?
I aint sure lol!Www@Enter-QA@Com

The horse's shadowWww@Enter-QA@Com

ugh!.!.!. idk!.Www@Enter-QA@Com

Your ego!.
Hah, that was mean!.
Uhh!.!.!. I don't know!.Www@Enter-QA@Com

i bet YOU don't even knowWww@Enter-QA@Com

(its all in) your imagination!?
=-0
idk!.!.WHAT!?Www@Enter-QA@Com

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