Two Hillbillies meet after an English exam:

Ey' how was the paper?

Oh it was just great, but I forgot the past tense of "THINK". I thought and thought for a long time, finally I just wrote "THUNK"

Ha ha ha, you are very silly, I thought about that for a while but I know the answer is "Thonk"

And what about the past tense of "Write"

Mmmm, I don't remember what i wrote on that one, I think I wrote "Written"

Well, let's hope you are right, I did not bother with the past tense of "GO", I just wrote "GOED" and went to submit my paper.