I find my husband so funny

He said something about his truck and I found it so funny, I laughed and he said, it ain't funny. I am not sure if he was serious when he said that because right after I laughed, I was feeling guilty. Then later that evening, he mentioned about looking for an automotive lifts, it is probably that has something to do with what he said, and I misunderstood it. Seriously, I feel bad about it I shouldn't laughed but I couldn't help it he looked like he was joking around.