!["I'll see you in hell!"](/bundles/cards/03189.jpg)
With Makeshift Trap (Improved Timer. + Net.) and some other tricks (Lure/Lure, Bait and Switch, "Get over here!"/"Get over here!", Predator or Prey) you can have your own antimatter singularity for 6 less XP than the boring vanilla Poisonous. + Explosive Device. combo.
Probably still only worth it in Calvin, but this way I think you can truly maximize the output of "I'll see you in hell!".
(I guess it's also viable in Tommy since he can easily take the trauma.)