Andrew Johnson was "stinking drunk" when he took his presidential oath

The inauguration of Andrew Johnson, the 17th president, took place the day after the assassination of President Abraham Lincoln on April 15, 1865. Vice President Johnson entered the room where Abraham Lincoln lay dying, when Mrs. Lincoln saw him she yelled and demanded that he leave the room.

When aides went to wake him up at his house in Kirkwood, he found him passed-out drunk and could not wake him up. When he finally woke up, he had puffy eyes and his hair was caked with mud from the street. A barber and a doctor were summoned to clean him up for the ten o’clock ceremony, which thankfully went smoothly.

(Source)