It is explained why affricate-stop sequences should be included among acceptable Croatian syllable onsets. First, there are a few words with initial affricate-stop cluster (e.g. Cr. čkomiti 'be silent, hold one's tongue'), in which the fricative sound often alternates with the corresponding affricate sound (e.g. Cr. žbun 'bush' → džbun). Second, there is the slang metathesis in which affricate-stop clusters become initial onsets (e.g. Cr. pička 'cunt' → čkapi). Third, there is syllabification in chanting, at sport stadiums or in rock songs. If affricate sounds are more sonorous than stops, which is not beyond doubt, the onset affricate-stop cluster would be yet another case of violating the Sonority Sequencing Principle, beside the well-known case of the onset fricative-stop clusters (e.g. E. spoon, street, Cr. spor 'slow', strah 'fear'). 2 According to the available data, [], [ǯ], and [f] are by far the least frequent Croatian sounds, see Škarić (1991: § 920) and Brozović (2007: § 370, count based on data from I. Škarić /1991/ and T. Maretić /1899/).3 When it could also have been the so-called mobile s, which could either have occurred or not occurred in many roots (on this matter, see Kapović 2008:178-179). *stē.mi 'I praise' *streb h -'turn' *h 2 stēr 'star' *Hyēwgst 'harness' (3.sg.aor) *muHs 'mouse' *pōds 'foot' *nok w ts 'night' spor 'slow' zbor 'assembly, choir' splav 'raft' zbroj 'summa' star 'old' zde.nac 'well' strah 'fear' zdrav 'healthy' skok 'jump, leap' zgib 'pull up' skra.ti.ti 'shorten' zglob 'joint, ankle' špa.ga 'rope' žbir 'cop' štru.ca 'loaf' žde.ra.ti 'devour' šče.pa.ti 'grab, seize' ždral 'crane' śću.ću.ri.ti se 'crouch, cower' 〈šćućuriti se〉 htjeti 'want'