1. Marcellas’s Veto Blunder (Big Brother 3)
Big Brother 3 was the first season to actually introduce the Power of Veto. So at the time, the POV had not completely become a saving grace for Big Brother players yet. However according to common sense, if Big Brother gives you a power that allows you to remove yourself from the block, you use it.
Up against his Big Brother 3 BFF Amy Crews, Marcellas Reynolds decided to not use the veto because he trusted his safety, but his trust proved very misguided as he immediately got evicted.
Marcellas’s decision ensured that no other Big Brother players would ever be so careless with the veto again. So at least that’s a positive.