"May I" vs "Can I"
If Ben was being such a strict grammar-nerd ("The word 'unique' cannot be modified.") he would never allow the kids to say, "Can I [fill in the blank]?" Ben never once corrected them to say, "May I [fill in the blank]?" And I noticed it quite a few times.
"'Extremely High Voltage.' Well, I don't need safety gloves, because I'm Homer SimpsonZZZzzzx--" - Frank Grimes