I like many things, but here are some:

• JavaScript
• HTML 5 canvas
• maths
• pie:
  • the number (I've memorised 36 digits)
  • raspberry (the computer)
  • chocolate
• minecraft:
  • commands
  • redstone
  • slime blocks
• factorio
• star wars
• harry potter
• d&d
• Google Apps Script (it's 90% JS)
• python (ish)
• cake (by GlaDos)
• fish-shaped ethyl-benzine
• water:
  • hydrogen hydroxide
  • H₂O
  • di-hydrogen monoxide