Our party had just crawled through muddy tunnels into a tomb, and fought some undead things. We were looking around, and I found a big mirror on the wall. The DM had me roll to see if I noticed anything odd about the mirror. I critically failed the roll.
He pauses for a moment, and then says, "You look terrible. There's mud all over you, and you have blood and dirt on your face and caked in your hair."
My character being somewhat vain, this was quite fitting. She worked on straightening herself out while the rest of the party figured out that the mirror was a portal. :)