ties

Ana_Cotta [CC BY 2.0], via Wikimedia Commons

ties

LooiNL [CC BY-SA 3.0], via Wikimedia Commons

thais

Mattes [Public domain], via Wikimedia Commons

SQUARES 008
two homonyms and a homophone walk into a bar...
...and the bartender says "Be with you in a minute; kinda tied up at the moment." Everyone laughs, ready to tie one on.