Example numero uno would definitely be grinding along to the bottom of a hill against the wind, and upon reaching the hill finding you only have 2 gears left!
Or maybe you prefer wind assistance and seeing that you are cruising along up a hill, looking down and seeing the Garmin say that you are doing over 45kph!!!
And for the scary nonsense it has to be leaning the bike over into the wind to try and ride in a straight line!
However you are getting your wind, do it safely!