I was there that day, and have always suspected that the "tshirt will rip" claims were bogus. I think no gi grappling is more unrealistic because people do wear clothing. If you don't train to use it then you are missing a fairly sizeable chuck of offensive capability. I have never had to fight on a beach, or at a pool where people were only wearing a rashguard and board shorts... and you can still grab those.
Anyway, I googled "street weapons" and found this:
"Pepper Spray Blaster
Soak a few pounds of crushed or ground dried cayenne peppers in warm 90% grain alcohol for several hours, then evaporate off about half of the alcohol over an electric hot plate outside in an open area away from flame. Filter with a coffee filter and funnel or a coffee press then load the liquid into a cleaned out fire extinguisher with a schraeder (bike type) air fill valve, be sure to clean the O-ring at the neck, don't get your pepper liquid into the neck threads. Only discharge if you are wearing a gas mask, caution spray is flammable. A modified metal tube on the end of the hose is good for getting under doors or drilled holes in walls. Good for clearing out big corpgov conferences when fogged into the HVAC system of a conference hall.
Paint the ex-fire extinguisher black and paint "TEAR GAS" or something else so it is not ever used in a fire."
YIKES!
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And even more YIKES! :
"Chains and Flexibles - Another easy-to-find item on street "arsenal,” the chain can be seen in all his forms, long or short, thick or thin. Very popular in rock/hardcore/punk gangs is sometimes used weighted at end with a lock. It is mainly used against knives and short weapons. From my own experience, a thick piece of chain can crush the flesh with those sinister terminal links since a thin chain can, literally, cut you. I saw on the streets both regular chains and distribution and bike chains. Bike chains are not so flexibles in all planes like an usual chain but can be wrapped over fist in a more suitable manner ( and its not so painful when you strike).
An improvement was when on the streets appeared the chainsaw saws. They have dents and they are used for strikes. The chain is held by an improvised rubber hose put over chain and the dents must face the hand to grab better.
I saw years ago in winter time a guy with an feather insulated coat stroked with such chain, his coat was ripped and the image was similar with an exploding pillow. Another form of chains is called here "japca" and consist in a very thin chain with fishing hooks tied with strong fishing line one inch apart from one another. Just imagine... A very rare form it is a slightly big fishing 3-hook anchor (around 8-12 cm. long) used to hook limbs, shoulders, or the back of the neck.
Not very popular but still there are chain flails or chain whips. These improvised "morning stars” have a lock or bike motric pinions for weight. Most used handles are from broom sticks which are used also for homemade nunchaku (which had his own golden decade on streets between 1980-1990). I believe these weapons never grow in popularity because their big mass and dimensions."
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Last one for now:
http://www.wigantoday.net/wigannews/Homemade-weapons-found-near-murder.4491820.jp(edit - consolidated three posts into one)
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Was there broken glass on the floor, or a river of lava flowing through the gym? What sort of protective gear would save you from the type of injuries you get from being thrown? It could be a case of negligence, but there are not many details. From the little info there is I am tempted to agree with the sentiment that it is ridiculous. Even under the safest of conditions people can still get hurt. If you don't understand that, then you need to find another activity.
OK, so far I have Dog Rene (cane fight) and Dog Ryan (left handed stick fight). 
It also may be far to complicated of a training tool 
