I don't think it is funny it is a serious question.
Anyway the thief on the cross was under the old covenant. At this point Jesus did not die for anybody's sins, he was still breathing. My opinion is that the thief went to Abrahams bosom, Christ preached to him with all the other old covenant saints.
The point is the man Jesus Christ could forgive sins before he was on the cross. Why couldn't he forgive sins of the cross?
Luke 23
36 The soldiers also ridiculed and made sport of Him, coming up and offering Him vinegar (a sour wine mixed with water)
37 And saying, If you are the King of the Jews, save (rescue) Yourself [[k]from death].
38 For there was also an inscription above Him [l]in letters of Greek and Latin and Hebrew: This is the King of the Jews.
39 One of the criminals who was suspended kept up a railing at Him, saying, Are You not the Christ (the Messiah)? Rescue Yourself and us [[m]from death]!
40 But the other one reproved him, saying, Do you not even fear God, seeing you yourself are under the same sentence of condemnation and suffering the same penalty?
41 And we indeed suffer it justly, receiving the due reward of our actions; but this Man has done nothing out of the way [nothing [n]strange or eccentric or perverse or unreasonable].
42 Then he said to Jesus, Lord, remember me when You come [o]in Your kingly glory!
43 And He answered him, Truly I tell you, today you shall be with Me in Paradise.
Matthew 10:32
Therefore, everyone who acknowledges Me before men and confesses Me [out of a state of oneness with Me], I will also acknowledge him before My Father Who is in heaven and confess [that I am abiding in] him.
In verse 41 the thief acknowledges his sin and remorse for his actions.
In verse 42 the thief confesses that Jesus King of the Jews and he would like to be apart of his reign.
43 And He answered him, Truly I tell you, today you shall be with Me in Paradise.
Sounds simple to me.