At people not getting the joke.
The whole pregnancy rumors really gained fire when she cancelled due to exhaustion and dehydration. Everyone assumed that because she was "exhausted", it meant she was pregnant. That's why Beyoncé stopped in the middle of the song, came down, and made that face like she was out of it, which made everyone hold their breath and think "Oh my god, not again. Is she really pregnant?!
" When she got up quickly and did that intense dance, that was the "Gotcha!" moment.
It's not that hard to comprehend.