Evidence Act ka Connection in Real Life

Ab maine socha, evidence toh har cheez me hoti hain. Take yeh example, maine aaj hi kisi friend ke saath dinner khaya tha. Mere doston ko lagta hai ki maine food par extra sauce drop kiya tha, par maine kaha ki maine thoda sauce kam kiya tha. Aisi situation me to main khud ko save karna hai n, to bas yeh karna padta hai ki meri statement ko prove karna. Yahi situation hai evidence act ka. Yeh act ke Section 3 me likha hua hai ki 'Every man is competent to testify upon any subject so far as he has knowledge thereof'. Isi liye, main akele hi thoda evidence collect kar sakta hoon ki maine thoda sauce kam kiya tha. Ab kya hoga?