It was hard to keep a straight face when he told that ridiculous story
The comedian's jokes were so funny, I couldn't keep a straight face
During the serious ceremony, she struggled to keep a straight face
He tried to keep a straight face, but a smile crept onto his lips
The teacher asked the students to keep a straight face and listen to the instructions
Despite the chaos around him, he managed to keep a straight face
She whispered something funny to her friend, and they both had to keep a straight face
He was so amused by the situation, he almost couldn't keep a straight face
It's important to keep a straight face when delivering bad news
The child's innocent comment made it impossible for the adults to keep a straight face
Did you see that dog wearing a tiny hat?
Yes, I had to keep a straight face so hard.
It was the funniest thing all day!
I could barely keep a straight face during the meeting
It was hard not to smile during the presentation
I struggled to look serious while he was talking