Verbalising my understanding of his frustration.
During a late night reading endless tips online about how to deal with tantruming children, i found some simple advice, tried it the next day & was astonished at it's magic. It worked, immediately. I just had to verbalise to my son how he was feeling, & tell him that i understood. I said to him through his tears and his yelling, "I know, i hear ya, you're feeling frustrated with mummy because you wanted to ... . I understand, it's frustating for you." He instantly became managable, ok still a bit teary but not...feral anymore! I guess we all just want to be understood! Even at the age of 2.