Memory Lapse has a self-replacement effect that replaces the spell going to the graveyard before any other effect can replace that event. If the spell was cast using flashback, however, flashback will change the spell's destination from its owner's library to exile.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.