Search and grab some services job that can be done fast, like creating a logo, banners, and more. But if it's really needed, the fastest is sell some possessions. Sell some electronic what you have, like laptop, smartphones, tv at low price.
Or, another option is pawned your jewelries or other valuable items that way,you can redeem whenever you have cash again. But,I always lend on my family members,those who has spare money to spend. That way no need a collateral and no interest.