If you search online for World's Largest Gummi Bear, you get a link to Vat19.com offering a measly 1/2 lb gummi and their 'World's Largest' at 5 lbs. They also claim "there is no candy more magnificent or more powerful". Well unfortunately for them I made an even bigger gummi sculpture (at 6lbs though not a bear) 7 years ago!
Gummi=Gummy. Haribo calls them Gold Bears. Black forest calls them Gummy Bears. Whichever you prefer. Original German was gummibär, so that probably originated the gummi bears.
I did this experiment in my youth. So don't blame the current me for the brash and questionable nature of this idea. You've been warned!
Step 1: Procure Gummis and cake mold
The cheapest 5lb or 6lb bag was from Brach's at 6lbs for $11.50.
The lowest $/lb ratio for gummi bears was from Albanese at $1.70/lb (10lb for $17) :
And going for only top quality from Haribo reveals this gem of a deal 12 lbs for $34.
This should provide plenty. For the Brach's there were 5 colors and for the Haribo and Albanese there appear to many more. So if you want a solid colored gummi monster look for places where you can either buy a bunch of one color or you'll have to buy many many pounds of this stuff.
How I came into 6 lbs of gummi bears was a funny story. After finding they sold such a delightful item at costco, I off-handedly mentioned they should be the token prize at a prize raffle for our highschool band end-of-the-year party. Because of my fortunate luck, I actually won said raffle.
Be creative when choosing a mold. I just got a cheap cake mold from the 99¢ store or something like that. I wanted to do both sides, but it turns out that would've required twice as much and I didn't want liquid gummi seeping through the seems of the mold.
Step 2: Separate gummi bears
For me, I wanted a full-sized gummi creation, so I just separated in order to add them in separately once melted. It created a rainbow effect.
Also you're serving this, please use a much more sanitary location than what I chose. Yes I know your heating these up, but just have some self-respect man.
Step 3: Melt Gummy Bears
The devil about this step concerns heat. Melted gummi bears are extremely burny and extremely sticky. This is a combination for disaster. If you happen to get some on your skin, you can't wipe it off without smearing over more skin and burning more area. Running it under water of course will cool it down, but you might have burns. Therefore, don't let any animals or little kids get near this. If you're very worried about it, wear oven mits when holding the pot.
Step 4: Line mold and pour
Depending on the color effect you want, mixed, separated or something else pour the colors at the same time and mix them with a utensil (don't touch the melted gummi!). Or if you're limited on pots and don't care about interesting effects you can heat up a pot and pour, then go to the next color. This gives a rainbow effect of whatever colors you have.
If you actually do this instructable, I want to see pictures of the finished creations. I have no doubt this community will able to come up with tantalizing better ideas than Vat19's single color bears.
Step 5: Refrigerate (or freeze) and serve when cool
When you serve this beast, it will need a knife to cut. Slice it into 1/4" pieces or so and it should be easy enough to chew from there. A single ounce of gummi contains roughly 100 calories, which means there are approximately 10,000 calories for a 6lb gummy monstrosity. So this is a calorie dense snack. Don't let your little brother run off with this thing or he'll be hyper for weeks!
Step 6: Gummy Bear Links
Update: ARRRGGGH Vat19 touts the World's Largest Gummy Worm at 3lbs! They aren't even trying!!
The obligatory wikipedia article
Middle of the page, this guy made sculptures out of individual gummi bears
The gummibär song. Definitely listen to the german version, but there is also an english version.