I think I've heard it somewhere but fail to remember. When you're single and you're attending someone's wedding, it may come to you that you want to get married, too. The thought or feeling might go away the day after. Is there a word or expression to describe this? As a context, think of two friends attending a wedding going,
A: You know what, Sam? I want this. I wanna get married. Yea, it's time to settle down.
B: Easy pal. You know it's just ...... . Many people get that.
Take the liberty of rearranging the words if there's an idiom or fixed expression to describe this.