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Hajde da ludujemo (English translation: "Let's go crazy") was the Yugoslav entry to the Eurovision Song Contest 1990, held in Zagreb, SFR Yugoslavia (present day Croatia).
The song was composed by Zrinko Tutić and Alka Vuica, and was sung by Tatjana Matejaš, commonly known as "Tajči", in the Serbo-Croatian language.
On the night of the contest, the song was performed 15th, following France's Joëlle Ursull with "White and Black Blues" and preceding Portugal's Nucha and "Há sempre alguém". At the close of the voting, it had received 81 points, placing seventh in a field of 22 countries. The song was succeeded as Yugoslav entry at the 1991 contest with Bebi Dol with "Brazil".
It was covered by Ivana Banfić in 1999.