Let’s dance:
I’m so strong I can crack a pair of walnuts…with my pair of walnuts!
Haha!
Are we talking mental strength or physical?, Physical i can lift and carry upto a hundred pounds uphill for about 25 to 50 yards. I am 5’5" 110 lbs. I do not know if that is strong but, it sure feels like it. Next day is hell now at my age 
I’m so strong I carry 20 extra pounds around with me all day just for fun.
I’m so strong that my Mother could bench 400 lbs. when she was pregnant with me.
I was so strong that I could lift her.
I’m so strong, I got into the Salty Spitoon.
I’m so strong I can see my forehead.
I’m so strong, I can see your forehead.
I’m so strong, I ripped your pants.
I’m so strong, I knitted the pieces back together into a more fabulous pair of pants.
I’m so strong I wore them.
I obviously have a strong stomach to read all of this
I’m so strong I make onions cry
-Imp
I’m so strong, Cap’n Crunch cereal doesn’t scratch the roof of of my mouth.
Some cereals have iron filings in them. Watch out for those! 
I’m so strong I made Pandora make the previous post with just the power of my thoughts.
I’m so strong i breath fire and kidnap damsels
I’m so strong I impregnated UglyPeopleFucking’s Mother with him despite the fact that he is older than me.
(Just kidding, UPF!)
I think it was xzc, but you did make me laugh.