A recurring gag in One Piece is that Usopp’s lies eventually come true. Usopp’s primary weapon is his lies. From his constant lying about daily pirate attacks in his hometown and telling strange adventure stories to entertain his friends in Syrup Village, Usopp has perfected the talent of telling tall tales. These lies are often ridiculously unbelievable, and only the most innocent or naive ever take them at face value, such as his friends Luffy and Chopper.
Notwithstanding their unbelievability, his lies have sometimes become true.
We understand that Usopp lies a lot, though what he doesn’t comprehend is that his lies ultimately become correct here are few lies that became true throughout his experience with the Straw hats.

All Lies Of Usopp That Became True

Pirates are invading the village. Kuro’s army actually attacking.
An enormous goldfish with poop as big as an island. Dorry & Broggy validated it.
Country of Dwarf, Tontatta Tribe.
A gorgeous female swordmaster that brought a lot of meat (Rebecca getting Luffy three bentos at the Colosseum).
Wanted to witness a huge mole in Kaya’s house. Fight with Mrs Merry Christmas.
While Syrup village arc, they act to chase “Cerberus”, while chasing a normal dog (Usopp met an actual Cerberus at Thriller Bark).
Claimed Luffy’s prime bounty is his. Got his initial bounty at 30 million Berries.
A big condor, flying into the skies (The big condors Chopper joined during the 2-year time-skip. Usopp travelled one while the reunion).
Loathsome snowman (Rock & Scotch, the Yeti Cool brothers).
Usopp and his friends also act to catch a dragon (The Straw Hat Pirates truly capture and eat a dragon at Punk Hazard).
Usopp is a specialist in sniping. Birth of Sogeking.
Has 8000 followers. Well, the Elbaf warrior, the dwarf, & all the toys that convert humans again.