He might not couldn't refuse.

source: 
DiPaolo
Entry: 
1332
Example: 
He might not couldn't refuse.
Modal 1: 
might not
Modal 2: 
couldn't
Gender: 
Male
Race/Ethnicity: 
White
Age: 
unknown
Level of Education: 
Unknown
Home Community, Town, or State: 
TX (Unknown)
Location Collected: 
TX (Austin)
Relation to Addressee: 
unknown
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic