I have a naughty pixie too - Only mine is about 6'4"!!
#1 is terrible for walking round & randomly picking up an object, twiddling it then wandering off leaving it in some bizarre place - He does it subconscioulsy, you point it out to him, show him where he put, he really has no idea he has done it - It is actulay quite funny to watch, until of course you are looking for something that you know for a fact you left on the table/worktop/windowsill/shelf & you know for a fcat that he has deposited it in some place that may take days to find!
Once after spending hours looking for my gps i found it on the upstairs bathroom windowsill, I hadn't even been upstairs since getting home, he denied it was him & I shouted M"ust have been theose naughty pixies again" the name has stuck since!