The most insane gambit I know of is the Nakhmanson Gambit.
But the only serious gambit I actually play myself in real tournament games is the Muzio gambit (King's Gambit but sacrifice the knight on f3 for rapid development and control of the centre).
btw @pfren, I play more blitz and bullet than you do, so I know what moves can throw your opponents off track. Playing d4 sets a trap of Black taking on e4. I've won countless games, maybe 100, where black, not knowing what to do, carelessly takes on e4.
So you're bragging that your low quality moves beat unprepared and weak opponents?
"Weird flex"