worst ever move. I agree but 3.Ke2?? in the Centre Counter (Scandinavian) is another candidate.
1.e4 d5 2.exd5 Qxd5 3.Ke2
There is a legend regarding this position.
Apparently on move 3 White intending 3.Nc3 played 3.Bc3, an illegal move.
Black insisted that White put the Bishop back on c1 and, according to
what ever rules where in place at that time, make a King move.
Such a rule did exist. From William Lewis in 1835 in 'Chess for Beginners' we read:

In the same volume we read that unless you say 'Check' when attacking a King a player can ignore it.

So here when White has played Rd8+ and was just about to say check but Black quickly played Rh1 mate. (and announced it)
I want both rules reinstated, especially 'the 'you must announce check' rule.
It would be brilliant hearing 'check' getting shouted out all over the tournament hall.
And think of the squabbles with players denying one player said check and positions
with two Kings in check because the players have refused to speak to each other.
Stewart, next time you meet the rule makers, can you please put this one on the table.