Raiders of the Lost Ark/YMMV

Harsher in Hindsight: As Indy speaks with Marcus while packing for his trip, Indy says "You sound just like my mother" as he dismissively speaks of the Ark's powers (which turn out to be very real). In Indiana Jones and the Last Crusade, we learn that Indy's mother passed away during his childhood, and his relationship with his father fell apart afterwards. And he grew to hate his father for being so obsessed with the Holy Grail, rather than focusing upon Indy.
Hilarious in Hindsight: "There's a big snake in the plane, Jock!"