Sometimes you don't even have to do that...

Years ago, when I felt I needed some practice with a 35mm SLR camera, I loaded a fresh colour film and 'burned' the first few frames (this is recommended to ensure that your first 'serious' frame has not been compromised by outside light) ... now, when you 'burn' frames, you just click the shutter a few times; no aiming, no focus or light adjustments ...
and then I'd go around wherever I was and play photographer (I did this even when people were paying me to take pictures ... I'd just play photographer)

... but when I see the processed results

... sometimes, a 'burned' frame may have the most interesting picture on the whole roll!

And what was meant to be a discard has become photographic art
One of my 'burned' frames is an unfocussed image of the very tip of one finger against a dark but bluish background ... and it looks for all the world like a probe image of a limb of Titan or Venus or some other heavily clouded planet...

I'll have a look, and I will see if I can scan it and post it on the gallery (... that might mean first having to find and reload the scanner software ...

)