When you are studying for History exam and is also a Hetalia fan: 

really, i made those before exam to remember the timeline of WWII and Cold War 🌚
most importantly, it works 😂😂😂
music used:
G. Handel: Harpsichord Suite in D minor Sarabande HWV 437
G. Bizet: Larlesienne Suite no. 2 Farandole
Hetalia: Marukaite Chikuyuu (music box version)