he becomes his split personality "Ricardo Montana"
who does a thick (and awful) Cuban accent
then threatens people and insists he's the new drug kingpin of Miami.
This is terribly unfunny but it does set up a couple of funny punchlines. The final one is the revelation of the (heretofore unseen) head of the drug cartel. SPOILER for those who actually think they will see 72 HOURS: the kingpin is played by Andy Garcia, who rebukes Hart at length for his cultural insensitivity. That's actually pretty funny.
Ends w/ Hart looking directly into the camera and promising a sequel, then obligatory outtakes during the credits.