When one feels ashamed of what they thought they knew.
Person A: wow it's so weird that we have 7 planets when we only live on 1.
Person B: um there's 8 planets O.o
Person A: oh yeah, I knew that :D
Surprising large breasts that aren't detected until unwrapped.
I can't really tell what's going on under Susan's puffy blouse. You think she's got some Secret Santas?