My favorite is when google translate translates the Chinese word for product/item/thing as "baby." You shop for babies, babies go on sale, here, have a coupon for $2 off any baby! If it doesn't work out there's always the "return defective baby" button!
This reminded me of the song "All that she wants" by Ace of Base. The mistranslation of the word "baby" makes the song sound like it's about a woman who wants more kids, rather than a woman who wants a lover.
Another very ironic example of that is this recent Reddit post [1], where the name "Nasser" was censored in-game to become "N***er", making it look much, much worse.