I feel like Frank would be more likely to try and kill someone for the sake of picking up women than Dennis. Especially since Frank is the one with the gun.
Also it would be funnier to see Danny Devito dress like the assassin and try and say he looks exactly like him.
This but with Dennis from always sunny, and then the gang has to stop him from killing frank to impress a girl.
I feel like Frank would be more likely to try and kill someone for the sake of picking up women than Dennis. Especially since Frank is the one with the gun.
Also it would be funnier to see Danny Devito dress like the assassin and try and say he looks exactly like him.