Is it wrong for me to laugh at..........

So today we went to the mall after Ashley got out of school to get her a new dress for a school dance and pick up some new drinking glasses (since we have noticed quit a few are cracked lately) While we were checking out the babies were getting pretty restless since I didn't get the glasses that actually had a tag we had to wait a bit longer for a price check. So anyway Preston kept putting his finger in and out of Lily's mouth pulling it back quickly and then they would both giggle. This went on a few minutes. Seeing this I could tell it was not going to end well. I said Preston you better stop Lily is going to bite you. Right then he started screaming......... as my face turns red and I start sweating we quickly get our bags and head for the door. He stops crying and proceeds to DO IT AGAIN!!!! The poor baby I couldn't help but laugh.