Anyone ever made a girl squint?

Used to go out with this girl, I could make her squint on demand.
I got the knack after lots of practice. She just couldn't help herself!
I would usually give her plenty of drink....then whoosh!
She'd be uncontrollable, at it like a rabbit. Using an umbrella wouldn't make one scrap of difference.
When I hid her glasses it would set her off. Once she started she just couldn't stop.
Looking for some advice on how others went about this