"How did it get there?!" you think.
Oh yeah, you were drunk beyond belief last night. Wait, how did you
get past the museum security?
Oh yeah, you worked there 17 hours ago and then quit (while drunk) and
then killed the detective (still drunk) took his hair (drunk) and
clothing (you get the idea) and wore them, then posed as him. And
now...
"WHAT THE FUDGECAKESS?!!?" exclaims Mayor Nelson. She sees
you.
You say, "Errrr... errrrr...."
You look in your pocket and find the diamond!!