Remus getting really obsessed with Disney movies and learning all the songs. Sirius watches them with him and memorizes parts of the script.
When Remus tells Sirius that werewolves are dangerous, Sirius says "You don't have to protect me; I'm not afraid!"
When Lily says she doesn't like James, Remus and Sirius break out singing "I won't say I'm in love" from Hercules.
Whenever Lucius Malfoy walks by, they start singing songs from Tangled.
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Wolfstar Headcannons
FanfictionIf you don't ship Wolfstar, then I recommend not reading this. But, hey, there's funny marauder stuff in here too, so why not?