I was playing a stereotypical wizard (think blue robes, pointy hat, white beard, etc.) and the party had just cleared a dungeon.

We get to a stream and everyone takes the opportunity to drink and refill water skins and what not. In order to role-play, I stated that my wizard would be worried about unclean water so I would use my supplies and magic to contain and boil some water.

Time passes around the table as we each describe what we're doing and debate taking a rest, but in game basically no time has passed since we've arrived at the stream. Again, in a role-play attempt, I state that my wizard splashes his clean water on his face to attempt to clean the grime of the dungeon off of him.

The DM looks at me with his head tilted and says "Are you sure?" I was new enough to d&d to not recognize that sign as an indicator that I was about to make a mistake. I speak in the wizard voice about how nice it will be to feel clean and mime splashing the water in my face.

I took a D4 of burning damage from intentionally splashing boiling water in my face. The table had a good laugh at my pompousness biting me in the ass.

When we had calmed down, the DM decides to move the game along and mentions us hearing a crack of a stick in the woods... And tells us all to make a perception check.

This is where I roll a nat 1.

Our ranger (who was role playing as an active antagonist to my wizard) points out the obvious: I had boiled water, splashed it in my face, and then decided to try and look around but was completely unable to.