not sure
You need an underwater case. there are rumors u dont need it but don't risk it.
I broke my wrist doing a flip.
what the hell is a flip flop you scum?
The serial number for a Stauer watch is typically located on the case back. You may need to remove the watch from your wrist and flip it over to see the engraving. In some models, the serial number can also be found between the lugs, where the watch strap attaches to the case. If you're having trouble locating it, consult the user manual or contact Stauer's customer service for assistance.
no unless u have da underwater attachment
If you are referring to closing the cylinder of a revolver by "flicking" your wrist. it will increase wear on the weapon, and CAN break parts.
No because if you do a back flip handspring with a weak wrist. You could end up with a bad rist and your back flip handspring ould just not look right. If you have any questions about anything just rite:)
A flip case
To successfully flip a bottle, hold it by the neck with your wrist slightly bent. Flick your wrist to give the bottle a spin as you release it. Aim for a smooth, controlled motion to land the bottle upright. Practice and adjust your technique for better results.
Jump and tuck your head and exhale through your nose and just keeping practicing!! 
A flip-flop is a kind of sandal which is a kind of shoe so kind-a-sorta, yes.
the speed happens by having a fast arm circle and a strong wrist flip. hope it helps.