Nowadays there are some really annoying CAPTCHAs out there, such as:

• "Click over the figures that are upwards/downwards" and various rotated bears
• "Rotate the figure until it matches the given orientation" and a finger pointing to some random direction, as well as rotation buttons that don't work the way you would mathematically expect them to work
• "Select all the images with a bicycle until there are none left" and the images take centuries to fade away after you click them
• "Select all the squares containing a bus" and there are squares with the very corner of the bus that make you wonder if they are considered as part of "squares containing A bus"
• "Fit the puzzle piece", although this is the least annoying one

In summary, the CAPTCHAs seemingly are becoming less of a "prove you're not a robot" and more of an forced IQ test. I can see the day when CAPTCHAs will ask you to write down a Laplacian transform for the solution f(x) to the differential equation governing the motion of a mass considering the resistance of air and aerodynamics, or write down a detailed solution to the P versus NP problem.