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SSH warning: authenticity of host can't be established

Problem

The authenticity of host 'example.com (1.2.3.4)' can't be established.
RSA key fingerprint is ab:cd:ef:12:34:56:78:90:ab:cd:ef:12:34:56:78:90
Are you sure you want to continue connecting (yes/no)?

Solution

ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no

Make sure you understand the security implications of doing this (Hint: they're not good).

(source)