Weight of the Moon
The Moon's weight is approximately 7.35 x 10^22 kilograms.
Unrelated Elements
Mr. Smith's 7,000 watermelons and 5 pairs of underwear do not have any relevance to the weight of the Moon.
These details appear to be included for humor or to illustrate a point rather than to form a coherent mathematical problem.
Conclusion
The weight of the Moon remains constant at 7.35 x 10^22 kilograms, regardless of the unrelated information provided.