Two examples of a Bond villain proudly demonstrating a hazard/weapon that may see some harm come to 007 himself: Teehee feeding the crocs, the reptiles themselves being the threat to Bond once isolated on the island; and Scaramanga demonstrating the power of the focused, reflected heat, by shooting Bond's seaplane, indicating that Bond won't be leaving.
While the scenes aren't strictly parallel, there's a similar structure to both scenes accompanied by a near-identical line.
Personally, I think LALD's scene is better. The threat is more palpable, and is actually used against Bond after the demonstration. Scaramanga's weapon seems superfluous and doesn't exist beyond the momentary explosion. The former gives Julius Harris time to really indulge in his character, and it's usually at this point in the film that I begin to truly appreciate his sense of danger, bizarre and charm. Not to mention it's probably the best scene in the film. And while the latter scene boasts Christopher Lee (which is always a plus), it seems to break up the flow of the final act.