Your favourite thing?

Let's exchange our favourite things?
#Just exchange the message on both of our favourite things, but some thing like a book may be physically exchanged.

If interested, drop me a line or some;p

The more you wrote, the longer I will reply.

Response may not be returned within 24h, but promise I will read every serious reply and response will be guaranteed in an appropriate amount of time.

Hope by sharing now will make this summer even greater than before!

Thanks for your time.
It can be including but not limited to the following:
your favourite book(s)
sport(s)
recipe(s)
formula(s)
equation(s)
theory(ies)
line(s) of code
experiment(s)
song(s)
sculpture(s)
place(s)
restaurant(s)
piece(s) of quote
speech(es)
foreign language(s)
goal(s)
question(s)
method(s)
model(s)
#Can be a person, but originally think the model to fit data.
disease(s)
virus(es)
bacteria(es)
body part
#Plz try not to get dirty in your brain.
poem(s)
device(s)
brand(s)
belief(s)
religion(s)
#Ok, normally not plural
physician(s)
nurse(s)
story(ies)
teacher(s)
joke(s)
advertisement(s)
stock(s)
country(ies)
president(s)
celebrity(ies)
professor(s)
course(s)
field of research(es)
piece(s) of music
plant(s)
planet(s)
company(ies)
a nameless person(people)
game(s)
app(s)
project(s)
lawsuit(s)
debate(s)
conversation(s)
journey(ies)
software(s)
job(s)
hiking trail(s)
bottle(s) of wine
kind(s) of special food
author(s)
twitter account(s)
store(s)
vehicle(s)
personality(ies)
policy(ies) etc... Everything you can imagine even it doesn't exist right now or didn't be there anymore.