I was called to a local supermarket one time to remove some behemouth spider that came in with a shipment of bananas. Talk about relief when I found it wasn't a poisonous type but damn that thing was huge. Almost the size of the one in that guy's hand.
Looked like a big Tarpon to me in that last pic before the cute little dancing kitty - but just looked at the other one and inclined to agree w/Matt about it looking like an Alligator gar..