Conversation of The Loose Mice

The small (S) mouse said 'you can measure your weight' to the big mouse (B) as pointing at the scale, and the big mouse stepped on the scale.

S; Ah... you've gained 1 kg since last time.
B; Really? Oh, I have a stone in my hand! That's why!
S; Mmm......
B; What about you? Why don't you measure your weight?
S; Ok.
B; How's that?
S; Oh, no! I've gained nearly 2 kg!
B; Ahh...
S; ..... Hang on, I'm wearing this jumper.... and you had the stone, right?
B: That's right. That must be the reason..
S; You are right, you are right.

The both used items as a convenient excuse to avoid the main issue...