The best would be - Just laugh back at yourself - because there is something funny about you and you must laugh too.
When you laugh - you leave amazing response to the people like -
1. You find that funny too.
2. It is very authoritative.
3. It sets friendly environment.
4. It also tells, how mature you are and you can't get bullied that easily.
5. **Importantly**, it also tells you were not sure, how did that happen and it could be by mistake or you did intentionally to make everyone laugh in boring environment. Don't forget, It's hard & amazing skill to make someone laugh and make their day awesome.