Best way to kill a frog?

Ben's pet frog is lame. Well, it's been that way for a few months. But now it seems to have a defective swim bladder(+) as it's unable to get under the water and it lists to starboard. Infact it's entirely on it's side.

Debbie wants me to put it out of it's misery.

It's quite easy for someone to say they want a frog killed, but if your the one tasked with the act, it's not that simple.

- Hit it with a brick?
- Chop it's head off?
- Lethal Injection?
- Carbon Monoxide Poisoning
- Cyonide Tablets



(+) I'm assuming they have some kind of bladder for buoyancy control, but I could be wrong! I ain't no frog expert, frogologist, whatever.