Seriously that IS how we used to grease our chains when I was a teenager, put bike on main stand, start, select 2nd gear and a fist full of grease and "gently" grasp the chain letting it slide through your fingers.
I was being a good big brother showing my little brother this technique when he was about 16, but he failed to understand the "grasp gently" part and next thing his fingers are all mashed in the rear sprocket under the chain.
Boy did I feel sick, had to slacken the chain while he tried not to scream and then rush him off to hospital.
All good in the end, his fingers luckily chose a sprocket low point and the chain wasn't adjusted as tight as it should have been so no permanent damage.
I no longer use this method and I still remember the ear bashing Mum gave me 36 years later.