Electric Wheelchair

Alright listen up, egghead. So, like, Stephen Hawking was super famous but also needed a wheelchair because he wasn't able to move. The joke is that you'd use an "electric" wheelchair to "execute" him, playing on both the chair being electric powered and "execute" meaning to put someone to death by electrocution, get it? You probably don't, since you're denser than a neutron star, but whatever.