First of all let me say that any prank that hurts anyone is not a prank. Pranks are made for fun, even if embarrassing, but not to hurt anyone. So if your prank can hurt someone, then you are not a prankster, you are a slug.
I have over 500 pranks I have pulled, and although some have used them on older people that could have died, I never did anything of the sort. This prank I came up with a long time ago, and have used it in several variations.
The thing about guys is they love big frogs, not to hurt them, or to eat them (although some do), but just the chance to catch one and share it with others is a big boost to their egos. This man convinced his friend he has a giant frog under the bucket. The excitement is high. Now to catch it alive!