Be swept off (one's) feet phrase
To fall in love with someone quickly and strongly; to become greatly admiring of someone; to be particularly impressed or charmed by someone because you have a very strong feeling of love for them.
I was completely swept off my feet at how attentively he treated me.
When he poured his heart out with a confession of love, she was swept off her feet.
He was swept off his feet at her exotic beauty.
Wholly enamored (of someone)
This phrase dates from about 1900.
People are always inclined to flatter or please a rich man by laughing at his joke which may not be a very good one.
Everyone at the table always flatter the boss by praising his humor. A rich man's jokes are always funny.