Why did the donkey give Bil'am such a lengthy response?
Rashi and Targum Yonasan: When they asked Bil'am why he was not riding a horse, he replied that he had forgotten it in the meadow, 1 to which the donkey retorted "ha'Lo Anochi Asoncha!"; When he replied that that was only for transporting loads, but not for riding, it retorted "asher Rachavta alai"; And in response to his reply that that was only temporary, it replied "me'Odcha ad ha'Yom ha'Zeh!" 2
Targum Yonasan, and the donkey was only borrowed.
What is the meaning of "ha'Hasken Hiskanti ... "?
Rashi #1 (citing Onkelos) and Seforno: It means 'Am I accustomed to doing this to you'? - a sign 1 from Heaven that he was not destined to succeed on his mission, and should therefore retract.
Targum Yonasan: It means literally 'Did I ever intentionally do such a thing to you?'
Seforno: As the Gemara says in Chulin, 95b 'Even though one may not divine (act based on superstitions), one may heed a Siman'.
Avodah-Zarah 4b learns from "u'S'hi Lo Sochenes" (Melachim 1, 1:2) that Hiskanti refers to Bi'ah. It says there (verse 4) that David did not have Bi'ah with her!
Moshav Zekenim citing Ri: Since a verse needed to say that he did not had Bi'ah with her, we infer that normally, it refers to Bi'ah. 1
Moshav Zekenim: His servants intended that he have Bi'ah with her, but he did not want to, for he could not marry a 19th wife, and he did not want to divorce one of his wives.