My Nepenthes rafflesiana.
It has a kinda rough history. I used to keep it in full shade where the pitchers died until I knew how much light they actually need and now it's growing nicely, except for 1 branch that wont make pitchers (Tendrils dont even start).
Latest pitcher opened today, is about 4 inches tall with really nice red coloration
Compare to the first pitcher it made when I moved it... half the size (Not visible in photo, the other one is the second pitcher it made)
And of course, a requirement for any Nepenthes thread... TEETH!