The following image has been shared, commented on and liked hundreds of thousands of times in its short life online.
Accompanied by the caption "How many 3's do you see?? I bet no one will get this right!" and a request to "share the page" if you work it out, the post does indeed seem to have people confused.
A quick glance of the 145,000 or so comments confirms this:
People just can't work it out:
They demand to know the answer:
Some people seem quite confident about it:
And others have some different theories about what's going on:
Are we counting code as well?!!
What do you think?
A lot of the confusion seems to arise from the fact that at least two of the 3s have been snuck onto the keypad in unexpected places - like where the "8" should be, and in place of where the "i" should be.