Laos is easy at the border (have a passport photo handy). India was the hardest visa I've ever done... and I have gotten them for Yemen, Iran, Turkmenistan, Syria, North Korea and others...

For India, we needed a copy of a utility bill in both of our names (having a Driver's License was not sufficient proof that we lived where was say we lived). A copy of the bill wasn't good enough, they needed an original and since my wife was not on it, it became a day-long nightmare trying to resolve it.

I have a 10-year visa for India now, but I'll never apply for another so I have to get all my India travel in. They did want to know dates of entry. The Consulate people were rude and impossible, but at the immigration in Kochi it was no problem and all very nice.