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If you have an emergency, and need to secure items together, but you're out of glue, don't have a cow. Milk one.

[edit] Steps

Pour an 8 oz cup of milk into a pan.
Heat this on a stove at 120°C (250°F). Let it warm, but not boil.
Add a tablespoon of vinegar, and stir the mixture. Continue stirring even when solid clumps of material form on the surface.
Place the strainer over the jar (preferably resting on it), and pour the mixture through the strainer.
Use the spoon to press the clumps through the strainer, and release the liquid.
Remove the material from the strainer, and place it back in the pan on the stove.
Add 100 ml (½ cup) water and a tablespoon of baking soda.
A casein material will begin to bubble. When this stops, use the leftover liquid as glue.

[edit] Warnings

Wait several hours before using any item secured with this glue.
This can be very messy; make sure you take care, and tidy up the area when you've finished, or preferably as you're going along!