(sobbing) "Camo- camo- camoflague. Paintin' camo- camo- camofl-"
Source: How The Hunger Games Should Have Ended and How The Hunger Games Should Have Ended- Slender Games
Note: After defeating Cato, Katniss and Peeta are informed by the heads of the Game that the previous rule change (there will be two winners) has been revoked, before trying to convince them to kill each other. After this, Peeta and Katniss then question them on what if they refused, stating that they have to have a Hunger Games victor, and threatening to commit suicide by eating poison-laced berries. Unfazed, they wait for Katniss and Peeta to proceed, until Katniss then confesses she doesn't truly love Peeta, as he ends up eating the berries and dies. The second quote comes from when Peeta is desperately trying to camoflague himself (while singing a parody of Coldplay's song Paradise), only to bump into Slenderman and be captured/killed by him.