give me your worst number systems

so recently I decided to put a base 9 number(/color?) system in a conlang and that made me wonder what other cursedness could arise from conlang math. so give me your worst and weirdest, including counting to 10 from 0 in it

counting to ten in my language:
wu´u wywäa wywää wywäi wewäa wewää wewäi wi´wäa wi´wää wywäa´ue wywäa´uewywäa
IPA
/ɤ̞̹ɯ̹ʔɯ̹ ɤ̞̹e̞̹ɤ̞̹ɑ̹a ɤ̞̹e̞̹ɤ̞̹ɑ̹ː ɤ̞̹e̞̹ɤ̞̹ɑ̹i ɤ̞̹əɤ̞̹ɑ̹a ɤ̞̹əɤ̞̹ɑ̹ː ɤ̞̹əɤ̞̹ɑ̹i ɤ̞̹iʔɤ̞̹ɑ̹a ɤ̞̹iʔɤ̞̹ɑ̹ː ɤ̞̹e̞̹ɤ̞̹ɑ̹aʔɯ̹ə ɤ̞̹e̞̹ɤ̞̹ɑ̹aʔɯ̹əɤ̞̹e̞̹ɤ̞̹ɑ̹a/
gloss

0 1 2 3 4 5 6 7 8 1-*9 1-*9-1

technically could also be glossed RED AMBER YELOW GREEN TEAL CYAN BLUE RED-smallBRIGHTER RED-smallBRIGHTER-RED, but the "RED-smallBRIGHTER-RED" is the clue that it is a set of numbers and not colors