What causes my horn to start blarring after i crank it up the stops when i turn engine off

What is your question?

Just started last night. My key fob is broken but will still crank my car if I hold it together. Last night after I cranked my car the horn would start going off non stop until I pulled over and cut the engine. After it done it twice my car wouldn't even crank. I got my key fob to lock the doors so I know it wasn't the battery. Could I have done something to the fob to make it go in anti theft mode. If so how can I get the key to re program to the ignition so it will recognize the right key.

What makes this problem better or worse?

It just done this last night first time

How long has your 2011 Honda Accord had this problem?

1 night