[r8rh8rmike]

Not exactly sure if it qualifies as a blunder, but in the 1989 NFC Championship game against the whiners, with a 3-0 lead Jim Everett fluttered a pass to an absolutely wide open receiver for a sure touchdown that Ronnie Lott was able to knock down after racing across the field. The Rams never recovered and instead of going up 10-0, they were crushed 30-3. In addition to losing that game, the Rams subsequently went on the excruciatingly painful nine year skid. That was one costly bad pass.