Matthew Perry often referenced Batman in interviews, and even had a Bat Cave in his former Los Angeles apartment.
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Anyone else find this concerning?”: Matthew Perry's Obsession With Batman Gets a Strange Twist After FRIENDS
Matthew Perry's Mysterious Posts Filled With Batman References Marked His Last Days Online
Matthew Perry's Batman Posts Before His Death: What to Know – Hollywood Life
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Matthew Perry's strange posts about Batman before his death cause fan concern - video Dailymotion