Leprechaun 6: Back 2 the Hood (2003)

Emily and Lisa are chilling in the hood with their friend Jaime, while Emily's ex Rory rides around on his flashy motorcycle with his new girl.  Lisa invites Rory to a cookout in the park, which upsets Emily.  When she stomps off, the ground gives way and she falls into a hidden cave that contains a room with a little box of gold.

The four grab the riches and decide to split it evenly. Too bad Emily doesn't remember the warning she just received from a psychic who stated she would get riches beyond her dream but she should refuse them because they'd bring nothing but heartache.  This turns out to be true when our little leprechaun friend shows up wanting his gold.  You'd think he'd do a better job hiding his precious gold but people always seem to find it. Stupid evil leprechaun.

Basically if you've seen one leprechaun film, you've seen them all.  They can all be summed up by saying someone steals his gold and he tries to kill them.