The Valsalva manoeuvre is far less exotic than the Picard manoeuvre, but likely more applicable to situations which most people encounter.
Dandelion-Utilitarian
Formerly HexDSL. Writes well, draws badly and is not good at updating websites. I sincerely enjoy sharing things on the internet but am no longer interested in creating video media. I'm here with my Mac and a notebook, not caring what the rest of the internet is doing.