Try not to scare the shit out of the robber

found on Imgur

I know what you're thinking - Why shouldn't you scare the shit out of the robber? The answer is quite simple. Robot vacuums and shit are a very bad combination

Don't bring a gun to a hand fight

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You either need to have faster reflexes than your opponent or you need to maintain enough distance to avoid this expert takedown. A handgun is a weapon that can harm at a longer distance than someone's arm, so as long as you stay out of arm's reach you should be able to maintain the advantage.

You're a prisoner, Harry

found on Izismile

Imagine being so trusting that you try to use your newfound invisibility without testing it first.

You can't grab if you can't smash

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They put in so much effort but seemingly it was all for naught. This kind of thing requires the crook to be able to get in and out quickly, because alarms were probably already triggered. The polycarbonate glass won't hold up to that kind of attack forever but it doesn't need to. It only needs to slow the robbers down enough that they either run out of time or get caught.

More than just sticky fingers

from here (source article)

Well, it's good to know at least one of these melon-heads has already been arrested. I'd hate to find out something as ridiculous as melon masks actually worked as a disguise.

Don't bring a gun to a mop fight

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I don't know if perhaps the gun wasn't real or maybe the would-be robber didn't have the nerve to pull the trigger, but whatever the case, he was clearly less prepared for the encounter than the little old lady with a mop.

Criminal opsec can be a hard pill to swallow

from here

These fine gentlemen might have enjoyed their freedom a bit longer after their armed robbery if they hadn't left a literal trail of clues for cops to follow.