Yep.
When you really need someone, you don't have someone to help you...
for example, moving very heavy things in and out of the house... I moved an entire queen sized bed myself, and up a flight of stairs.
or to just hold your ladder while I am climbing up onto the roof and it's a weird angle... that was freaky.
and i'm planning to rebuild my deck this summer, and i'm doing it myself, so I have to build almost all of the jigs and plan it out as a one person job.