A Letter-gency
It’s not an emergency, it’s a letter-gency! Sometimes even small items like stamps can stop you from pursuing your dreams or pouring your heart out. This person probably had to send that letter to someone important and couldn’t wait a lot.
So instead of wasting time trying to find something to use as an adhesive, this person put whatever he could find on the letter and sent it away. At this point, we think bandages can also be used for wrapping gifts when running out of adhesive tapes.