Not seen the Giant Claw,looks terrifying.
Another one of mine is The Incredible Melting Man,though this one isnt a bad movie,in fact it boasted at the time some ground breaking effects,some of the acting is shite though,the main two being the nurse at the beginning and the general.
The kids playing are also sub par but overall i love this movie,when i first saw it at the cinema it blew me away,now a few decades on it hasn't got that same wow factor but it still holds a special place in my heart.