They may might overlook a slip here and a slip there, but they aren't going to overlook anything major.

source: 
Mishoe
Entry: 
69
Example: 
They may might overlook a slip here and a slip there, but they aren't going to overlook anything major.
Modal 1: 
may
Modal 2: 
might
Gender: 
Female
Race/Ethnicity: 
White
Age: 
30s
Level of Education: 
Graduate school (Some)
Home Community, Town, or State: 
Unknown
Location Collected: 
SC/ NC (Unknown)
Year: 
c1990
Relation to Addressee: 
student to group
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic