Gopalacampu 1.13.22

1.13.22

taj jñātvāsra-parāsabhāś ca paritaḥ sākrandam abhyāyayur
yān dṛṣṭvā paśupāḥ sa-mādhava-balāḥ śaśvadd hasantaḥ sthitāḥ |
hāsāveśa-vaśāt kṛtānavahitiṃ pratyak padābhyāṃ balaṃ
vajrābhyām iva dhenukas tam anudat tac caiṣa nābudhyata || [śārdūlavikrīḍitam]

Perceiving that, donkeys, bearing faces with teardrops, rushed up howling from all around;
seeing them, the cowherds, accompanied by Mādhava and Bala, stood constantly laughing.
With his two hind hooves, as if with thunderbolts, Dhenuka struck Bala, who was negligent due to being overcome with laughter,
and he did not even notice it.