By popular request in the comments of the "Fredrik" ambigram. :)
This one has an "F" and "k" that's similar to the one in the "Fredrik" ambigram, but the "F" had to become even more fancy to produce the "c" on the right side.
It's tricky here to balance the height of the "F". If you make the "ck" align with the other letters on the right, the capital "F" on the left is set a bit too low for a capital letter. It required a little tweaking, it can probably be done better somehow.
More of my ambigrams are here.