Going to Nepal? Will be trekking there? Stock up with passport sized photos as you will need them there.
You need them everywhere – when you are getting tourist visa in airport(one), when getting local SIM card for your mobile phone(one), when getting national park entry permits (one picture for each park you are planning to visit) , when getting Trekkers’ Information Management System (TIMS) Card(two). I was lucky as in TIMS office they accepted photocopy of passport page with picture as I run out of photos at that moment and only one left instead of two needed.