Human tend to look for the mighty, the powerful, the wise whenever they are faced with a challenge. It is so easy to think that we can't do it when we feel we don't have enough capability to handle the challenge. But, that's not what God thinks. There are 4 stories in the Bible where God use what the world considers weak, foolish and even useless to do extraordinary things. 

(1) Moses' rod

Moses performed a lot of miracles (including splitting the Red Sea for the Israelites to cross) with a simple rod. And with the same rod, he confounded the might of Pharaoh.

(2) The little boy's five loaves and two fish

With this little boy's humble lunch, Jesus fed 5,000 men (plus women and children which number is not even counted), and his disciples gathered 12 baskets full of leftovers. This is one heck of a buffet. 

(3) The jawbone of an ass

Samson slew a thousand Philistines, who were the enemies of God's people with a mere jawbone. The movie 300 does not seem so extraordinary anymore compared to God's works in Samson. 

(4) Five stones and a sling

David, the shepherd boy, brought down Goliath with five stones and a sling. Mind you, Goliath is a giant and the mightiest Philistine champion during those days. 

"But God has chosen the foolish things of the world to put to shame the wise, and God has chosen the weak things of the world to put to shame the things which are mighty."

~ 1 Corinthians 1:27