She goes up through four octaves within about a minute and a half at the end of "Love On Top". She can do this live. And while pregnant.
That halftime show at Super Bowl XLVII (2013). Holy shit, that was epic.
Especially remembering that she had recently come under fire for singing the National Anthem to a backing track at the Presidential inauguration about a month before. Despite nearly a decade of being a very talented performer, that fiasco required a certain amount of damage control, and boy did she pull it off.
The audience at her 2011 Glastonbury set sings the entire first half of "Irreplaceable" back to her. Doubles as Heartwarming as she is absolutely delighted by their response.
In December 2013, she suddenly dropped a surprised album without any promotion and it sold through the roof anyway.