What does 'in stitches' mean?

[Starr]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #520 "English Slang Idioms (104)", question 6

"Mike is one of the most humorous individuals I have ever met. He had my husband and I in ......... all night," Lilly said to Beth.

(a) hilarity
(b) stitches
(c) hyperventilation
(d) cramps

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #520 "English Slang Idioms (104)", answer 6

"Mike is one of the most humorous individuals I have ever met. He had my husband and I in stitches all night," Lilly said to Beth.

Correct answer: (b) stiches

Your answer was: incorrect
"Mike is one of the most humorous individuals I have ever met. He had my husband and I in cramps all night," Lilly said to Beth.
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It should be "in stitches", right?, not "in stitches"

Starr

[Mister Micawber]

Yes, it should be 'in stitches' (= laughing hard). We'll fix the spelling on the answer sheet, thank you.
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Native English teacher at Mister Micawber's