I.

1. cd / (or cd \)
2. rm -rf (or <c>rd /s/q)

II.

1. That the nice folks with the white, formal jacket with buttons up the back will arrive soon (with my meds || to take me away)
2. That the programmer considers him/her/it-self a real epic d00d among v4nd4ls

III. That your scenario probably happens rather frequently.

IV. That the tool were written to pop up a usage message, possibly beginning with the words

"Hey, stupid! RTFM!"