Have you ever accidentally deleted a save file? Or had an angry sibling purge your save data? the PS1 has a quick trick to recover that lost file. 

When you're looking at your save data in the Playstation memory card menu you'll see boxes that represent each of your saves. All you have to do to recover your last deleted data is press ALL of the trigger buttons together twice. 

Using your middle and pointer fingers, press L1, R1, L2, R2, twice in quick succession. Your save data will return to the menu immediately. 

This is a helpful hidden trick and a fun way to pull a safe prank on your friends while gaming. 

Watch a Tony Hawk Pro Skater File return to the memory card: