Can a target with the deafened condition be affected by the Tasha's Hideous Laughter spell?
The spell states "a creature of your choice", so I was just wondering if they needed to be able to hear or not.
The Tasha's hideous laughter spell states:
A creature of your choice that you can see within range perceives everything as hilariously funny and falls into fits of laughter if this spell affects it. The target must succeed on a Wisdom saving throw or fall prone, becoming incapacitated and unable to stand up for the duration. A creature with an Intelligence score of 4 or less isn't affected.
At the end of each of its turns, and each time it takes damage, the target can make another Wisdom saving throw. The target has advantage on the saving throw if it's triggered by damage. On a success, the spell ends.
Creatures you cannot see, creatures that are not within range, and creatures with 4 or less Intelligence are the only ones called out as being unaffected by the spell.
Compare this to a spell like suggestion, which states:
You suggest a course of activity (limited to a sentence or two) and magically influence a creature you can see within range that can hear and understand you.
Or a spell like dissonant whispers, which states:
[...] A deafened creature automatically succeeds on the save.
There is no such restriction with the Tasha's hideous laughter spell. Thus, it affects deaf/deafened creatures as it would any other creature.