in stitches
US /ɪn ˈstɪtʃɪz/
UK /ɪn ˈstɪtʃɪz/

1.
laughing uncontrollably; in a state of extreme amusement
:
•
The comedian had the entire audience in stitches with his jokes.
•
We were all in stitches watching the blooper reel.
laughing uncontrollably; in a state of extreme amusement