G-Whiz 
Where many changes occur CABANA
Gas up? AERATE
Under the weather, e.g. IDIOM
Theme: soft C changed to hard G in phrases
“Our overly fussy friend has a point”? THEPRIGISRIGHT
Boast a la Donald Trump? BRAGFORIMPACT
It's zero in free fall {and theme}
GFORCERATING:
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = No fun
