Mario Paint (SNES)
Fun with letters
On the title screen, clicking on each letter in "MARIO PAINT" will trigger some special event. For example, clicking on the "M" makes Mario shrink or grow. Click on the "O" to hear "Kazumi Totaka's song."
Raining cats and dogs... and trains... and Game Boys...
On the title screen, clicking the letter "P" in "MARIO PAINT" will draw some grass on the bottom of the screen. Wait a while, and a Starman will shoot down from above. If you click it, the music will change, and various sprites will start raining down.