The Nosdive bomb shot is probably to oldest bomb shot.
It was first mentioned in the Savoye cocktail book in 1930.
For the Nosedive bomb shot fill a shot with gin and put an olive into it.
Put the shot glass into a tumbler.
Fill the tumbler with ginger ale or water until almost to the top of the small glass.
Down the whole thing in one go.
You can find more than 70 of the coolest bomb shots here.