In 12th grade physics class, a kid - J.B. - walked into the room at the start of the class, silently held up his finger, and then simultaneously sneezed, farted, and burped at the same time. The 10 kids who were there already and the teacher gave him a round of applause.

Presenting to the emergency room...

A sneeze-hickup combo is also _very_ painful.

I've done them in tight sequence but never simultaneously. Much more research is needed.

lol. Can related. The pain was shielded by the laughs I had after.