Startle response Puns

So, as soon as I heard this I knew I had to share it with /r/dadjokes...

We both enter the building at the same time, I'm just behind my neighbour in the doorway and he gets a little startled as I grab the door to let him through. He says to me "Oh hello! I didn't see you there! How are you?" I respond with my simple "I'm well, and yourself?" out of courtesy of course. This is when he starts telling me about his dream.

"Oh, I'm just terrible, I had a horrible dream last night"

My response: "oh no..."

"I dreamt I was a muffler."

"A muffler?"

"I woke up exhausted."

I had not choice but to laugh and think of one of my fondest subreddits...