What's up with this ODD egg

[Carenm]

So far we have had all great looking eggs from our chickens ( 20 weeks - just started laying recently). Went out this morning and this was in the nest..... it's brown with white spots.

 

[sgtmom52]

Just a glitch in the spray paint station!

 

[E.G.Glayer]

Over the years I have gotten a few with white spots on them, not quite that much though. Also had a rough texture to them, Not sure what it was but the egg still tasted good. Maybe extra calcium or something?