HELP the less technically fortunate

I hate to see poor technique being used in the gym. Dead lifts with arched backs, cleans that are predominantly lifted with arms, bicep curls that don't involve full extension at the elbow, all of which as a gym going make my skin crawl, but as a conditioning coach fill me with an obligation to correct these woeful techniques. I don't feel big headed when I say "Hey buddy you might want to try and do A, B and C or you're going to hurt yourself and you'll benefit more from that exercise", and you shouldn't either! If you see someone who looks like their going to snap their back in half then do the right thing and give them some advise. More often than not people are willing to take all the good advise they can get and this is especially true for people who are new to the gym. 

I also often see instances when a couple of guys coming to the gym together, both will be pretty new to lifting but one of the two will have his own set of dumbbells he got for Christmas and will think he's the master of techniques because he saw a video on youtube or something on a popular mens fitness magazine's website. The worrying thing about this is that that guy's own technique is incorrect and he's giving this poor soul advise on how to lift. In this situation I insist that if you have any sympathy for your fellow human-being then you don your Super Man cape and jump in to the rescue and attempt to help educate both the offender and poor victim. 

Some of the key points to look out for:

- Bent backs
- Movements that don't actually have any extension at the joint which should be extended
- Feet agonisingly close together
- Swinging of weights
- Rotator cuff exercises that are clearly working anterior deltoid. 

So remember, the gym is a place of learning as well as exercising! The majority of people are willing to take advise.