A possible mainstream

[Silentone]

I once saw this movie where two boys and a girl take an antique car and skip school for some adventure, or something like that. Anyway, they stop next to one of the boy's father. The boys duck out of sight and the girl uses a trenchcoat, hat and sunglasses as a disguise. She pretends to flirt with his father and the boys possibly tickle her because you can see her laughing. My memory may be a bit off in a few areas, but I think it's accurate.

 

[Shem the Penman]

I believe you're referring to Ferris Bueller's Day Off, with the ticklee being Mia Sara.