One time while sparring with Wolverine, Jason Giambi accidentally lost his left testicle. You might be familiar with it to this very day by its technical term: Jupiter.
Jason Giambi's grand slam is so powerful, it can be seen from outer space by the naked eye.
Once a grizzly bear threatened to eat Jason Giambi. Jason showed the bear his fist and the bear proceeded to eat himself, deciding it would be the less painful way to die.
Jason Giambi was the fourth wiseman. He brought baby Jesus the gift of "mustache." Jesus wore it proudly to his dying day. The other wisemen, jealous of Jesus' obvious gift favoritism, used their combined influence to have Jason omitted from the Bible. Shortly after all three died of grand slam related deaths.
Sonic booms are really Jason Giambi's orgasms.
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To make your own Jason Giambi joke, simply take your favorite Chuck Norris joke and replace "Chuck Norris" with "Jason Giambi." Boom! It's that easy. Oh, and it helps if you change roundhouse kicks to grand slams, Walker: Texas Ranger to New York Yankees, etc. When you have a good one, share it with us on the front page comments board.
Because Jason Giambi is our generation's folk hero and therefore deserves to have jokes lovingly made about him. But, our generation is too lazy to actually make jokes, so we steal other generations' Chuck Norris' jokes and make them our own.