mumbo's actuall middle name is killsalot. 

so ya know how parents yell your full name across the house and your heart stoppes for a split second? yeah. just amagin this

so mumbo and grian were younger and just plaing some video games in mumbo's room. suddenly they both hear 

"MUMBO KILLS A LOT JUMBO."

yelled from downstairs. 

a look of horror crosses mumbo's face as grian burts out laughing.

nowadayys(idk if i used that right) when someone asks mumbo what the "k" in his name is, he always panicks and gives a different answer each time since he forgets what he says the time before. 

only mumbo and his fammily knows mumbo''s muddle name.. wel.. and grian.