You'd think he'd NOTICE he was eating a 9-ft. tapeworm.

Man sues Chicago eatery for $100K, contending he got a 9-foot tapeworm after eating undercooked fish there.

How does he know that restaurant is where he got the tapeworm?

In the lawsuit filed Monday, Anthony Franz said he ordered salmon salad for lunch from Shaw's Crab House in 2006 and fell violently ill. He later passed the giant parasite, which a pathologist determined came from undercooked fish, such as salmon.

At best, that proves he COULD have gotten the parasite there, not that he DID get it there.