It is my understanding it is safer to connect the engine block of the vehicle that needs charging with the negative, rather than going negative-negative.
Both work though.
I would be ashamed to admit this incident to my friends IA
You did it all wrong. You're supposed to hook red to red and then dump your beer all over the battery, grab the black terminal and then hook the black clip to your left testicle.
I weep for the future.
on the scale of good and bad
No need to weep for the future diastronaut, the stupidity I encounter on a daily basis already brings tears to eyes sometimes.
Both work though.
I would be ashamed to admit this incident to my friends IA