Ky did go through a phase like that. I wasn't too concerned with it though because I remember being "clumsy" what my dad called me. I have a freakish memory and remember being 3 years old.
I would spill every liquid in every cup I was given. I also used to drop things all the time. I also tripped a lot and didn't pay attention to where I was going quite often. My dad especially would get a little angry at me because I would spill milk every freaking time he gave me some lol! He didn't yell at me but he would always remind me not to be clumsy and to pay attention when I was holding a cup and I would get really nervous and tell myself "don't spill the milk, don't spill the milk" over and over again while I was drinking and through any meal and I would eventually spill or drop whatever it was I was worried about dropping/spilling. This went on for a long time, until I was in 1st grade I remember doing this. I remember because I remember that particular house we lived in from when I was 3 until 1st grade when we moved in with my grandma and my mom and dad broke up. Grandma didn't really care if I dropped things and she'd tell me not to get so sad about it and just clean it up lol! So after that I wasn't as worried about spilling/dropping and I actually stopped doing it.
Ky dropped things for a while. He didn't spill as much except when DH would tell him "don't spill that" and of course he would spill it after that because he was nervous, I could tell on his face. I would tell DH the story above and that he shouldn't be so worried literally about "spilled milk" that we could afford more and Ky could just clean it up if it got spilled.