Back in the day Japanese developers didn't have the budget or the control to make perfect Japanese-to-English translations... although probably no one really cared. They had to translate and export their games to the West as fast as possible.
So they can't be blamed for this really — but the results are too hilarious. We collected some of them below.
Source: Bubble Bobble intro
Source: Zero Wing intro
Source: Ninja Gaiden act 6 on the NES
Source: Ikari Warriors ending on the NES
Teenage Mutant Ninja Turtles
Source: TMNT (Arcade) ending
Source: Crime City (Arcade) ending
Fatal Fury Special
Aero Fighters 3
Source: Aero Fighters 3 (Arcade) endings
Source: X-Men Arcade
No text on the last one, but it's probably known by everyone. If not, check the source for some laughter. And of course, your submit picks are welcome with support that is visual.